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The middle photo was created using digital zoom from the top photo, which resulted in a loss of image quality. In contrast, the bottom photo was taken using the camera's optical zoom, which does not reduce image quality. Typically, digital zoom only becomes available after the optical zoom range has been fully used.

Digital zoom is a method of decreasing the precise angle of view of a digital photograph or video image. It is accomplished by cropping an image down to an area with the same aspect ratio as the original, and scaling the image up to the dimensions of the original. The camera's optics are not adjusted. It is accomplished electronically, so no optical resolution is gained.[citation needed] Digital zooming may be enhanced by computationally expensive algorithms which sometimes involves artificial intelligence.[1]

In cameras that perform lossy compression, digital zoom is preferred to enlargement in post-processing, as the zooming may be applied before detail is lost to compression. In cameras that save in a lossless format, resizing in post-production yields results equal or superior to digital zoom.[citation needed]

Lower-end camera phones use only digital zoom and do not have optical zoom, while many higher-end phones have additional rear cameras, including fixed telephoto lenses that allow for the simulation of optical zoom. Full-sized cameras generally have an optical zoom lens, but some apply digital zoom automatically once the longest optical focal length possible has been reached. Professional cameras generally do not feature digital zoom.[citation needed]

Not-deteriorated zoom limit

[edit]

An optical zoom camera can be zoomed to its optical limit, and further zooming is sometimes allowed by digital zoom. Digital zoom uses the centre area of the optical image to enlarge the image. By reducing the image size, digital zoom occurs without image deterioration of the output image, and some cameras have a "not-deteriorated image" mode or an image deterioration indicator.[2][3]

The table below shows the not-deteriorated zoom limit for some megapixel (MP) image sizes of a particular camera with optical zoom 24x, and digital zoom 4x for its maximum capability:

Image size Maximum zoom factor Not-deteriorated zoom limit Magnification of digital zoom
16 MP 96.0× 24.0× 1.0×
10 MP 121.2× 30.2× 1.3×
5 MP 172.8× 43.2× 1.8×
3 MP 215.5× 54.0× 2.25×
VGA 382.6× 172.8× 7.2×
  • Handheld. Zoom 10×, Optical zoom 10×, 2 MP from 16 MP maximum, ISO 800, 1/420, F/14.0, image is clear
    Handheld. Zoom 10×, Optical zoom 10×, 2 MP from 16 MP maximum, ISO 800, 1/420, F/14.0, image is clear
  • Handheld. Zoom 28×, Optical zoom 10×, and Digital zoom 2.8×, 2  MP from 16  MP maximum, ISO 800, 1/420, F/14.0, initial of deteriorated digital zoom, image is still clear
    Handheld. Zoom 28×, Optical zoom 10×, and Digital zoom 2.8×, 2  MP from 16  MP maximum, ISO 800, 1/420, F/14.0, initial of deteriorated digital zoom, image is still clear
  • Handheld. Zoom 40×, Optical zoom 10×, and Digital zoom 4.0×, 2  MP from 16  MP maximum, ISO 800, 1/500, F/14.0, image is still clear with some noise. Magnification in deteriorated digital zoom zone is 40× : 28 = 1.4×
    Handheld. Zoom 40×, Optical zoom 10×, and Digital zoom 4.0×, 2  MP from 16  MP maximum, ISO 800, 1/500, F/14.0, image is still clear with some noise. Magnification in deteriorated digital zoom zone is 40× : 28 = 1.4×
  • Handheld. Zoom 72×, Optical zoom 10×, and Digital zoom 7.2×, 2  MP from 16  MP maximum, ISO 800, 1/640, F/14.0, more noise, but the detail is still clear. Magnification in deteriorated digital zoom zone is 72× : 28 = 2.6×
    Handheld. Zoom 72×, Optical zoom 10×, and Digital zoom 7.2×, 2  MP from 16  MP maximum, ISO 800, 1/640, F/14.0, more noise, but the detail is still clear. Magnification in deteriorated digital zoom zone is 72× : 28 = 2.6×
  • Handheld. Zoom 72×, Optical zoom 10× and Digital zoom 7.2× taken in full resolution 16  MP, but resize to 2  MP for uploading, ISO 800, 1/680, F/14.0, more noise, but the detail is more clear. Magnification in deteriorated digital zoom zone is 72×: 10 = 7.2×, the bigger the number, the worse the image
    Handheld. Zoom 72×, Optical zoom 10× and Digital zoom 7.2× taken in full resolution 16  MP, but resize to 2  MP for uploading, ISO 800, 1/680, F/14.0, more noise, but the detail is more clear. Magnification in deteriorated digital zoom zone is 72×: 10 = 7.2×, the bigger the number, the worse the image

Some camera firmwares store lossily digitally zoomed images with accordingly reduced dimensions (width and height) rather than upscaling it to the original raster resolution. The benefits are reduced file sizes and the ability to calculate the zoom level from the image's dimensions, if not included in its meta data.[citation needed]

Cameras may have an intelligent zoom feature that allows an additional magnification of 2.0× on top of its optical zoom. Many cameras have 2 options: 1.4× and 2.0×.[citation needed] The intelligent zoom only uses the centre of the image sensor and does not interpolate the original resolution, so the resulting image quality is good in reduced resolution.[4]

Hybrid zoom is a concept used in smartphones that takes advantage of optical zoom, digital zoom, and software to get improved results when zooming in further than the lens' physical capabilities.[5] Smartphones with optical zoom have lenses with 3× or 5× magnification. Trying to zoom in further than this limit may result in loss of quality as the camera switches to digital zoom, though hybrid zoom may mitigate this. Many cameras, including mobile phone cameras, also employ lossless digital zoom for video recording by using the spare resolution of the image sensor for cropping by taking advantage of used video frame resolutions often being significantly below the available resolution of the image sensors.[4]

This means that, for example, if implemented correctly by the camera hardware and software, a 2160p image sensor would enable up to 2× lossless digital zoom for 1080p video recording, 3× for 720p video, and 4.5× for 480p video by using image sensor cropping.

The terms among camera and image sensor manufacturers are "Smart Zoom" (Sony), "Safe Zoom" (Canon), "Sensor Crop" (Cisco)[4] and "Intelligent Zoom" (Panasonic and others).[6] There are also cameras with digital zoom functions as high as 7.2× and Smart Zoom with approximately 30× total zoom (optical zoom 20× and digital zoom 1.5×) for 7MP from 16MP total resolution, and also 144× total zoom (optical zoom 20× and digital zoom 7.2×) for VGA 640x480.[7]

Aesthetic

[edit]

Photographers can purposefully employ digital zoom for the characteristic low-fidelity appearance of the images it produces.[8] The appearance of poor quality in photographs can be intentionally used to imply carelessness on the part of the photographer and a sense of candidness in the photograph.

See also

[edit]

References

[edit]
Revisions and contributorsEdit on WikipediaRead on Wikipedia

Digital zoom

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from Grokipedia
Digital zoom is a digital image processing technique used in cameras, smartphones, and video devices to simulate magnification by cropping the central portion of an image captured by the sensor and enlarging it through pixel interpolation, without altering the physical optics of the lens.[1][2] This method effectively narrows the field of view to focus on a subject but does not gather additional light or detail beyond what the sensor initially records.[3] In contrast to optical zoom, which physically adjusts the lens elements to change the focal length and magnify incoming light while preserving image resolution and quality, digital zoom relies solely on software algorithms to upscale the cropped image.[4][5] Optical zoom maintains sharpness and detail across its range, often specified in terms like 3x or 10x based on the lens's focal length variation, whereas digital zoom can extend magnification further—up to 80x or more in some devices—but introduces artifacts such as noise, blurring, and reduced dynamic range due to the lack of new pixel data.[6][7] The primary advantages of digital zoom include its simplicity, as it requires no mechanical components, making it ideal for compact devices like point-and-shoot cameras and mobile phones where space for complex lenses is limited.[8] However, its disadvantages are significant: the interpolated enlargement often leads to a loss of image fidelity, with visible pixelation at higher levels, prompting many experts to recommend avoiding it in favor of cropping images post-capture in editing software for better control.[9][10] Digital zoom has become ubiquitous in consumer electronics since the rise of digital imaging in the late 1980s and 1990s,[11] particularly in smartphones where it complements limited optical capabilities to achieve high advertised zoom levels, such as 100x in flagship models.[12] Recent advancements in computational photography, including AI-driven super-resolution and noise reduction, have mitigated some quality losses by intelligently reconstructing details during digital enlargement, enabling clearer results in scenarios like telephoto wildlife or moon photography.[12][13]

Fundamentals

Definition and Principles

Digital zoom refers to a software-based technique used in digital imaging devices to simulate magnification by cropping a central portion of the image captured by the sensor and then enlarging it to fill the frame, without any physical adjustment to the lens optics. This process relies entirely on the existing pixel data from the camera's image sensor, effectively narrowing the field of view while maintaining the original aspect ratio. Unlike optical methods, it does not gather additional light or detail beyond what the sensor initially records.[14] At its core, digital zoom operates on the principle of pixel manipulation, where the sensor's raw data—comprising discrete picture elements or pixels—is selected, cropped, and resampled through interpolation algorithms to create the illusion of closer focus. Common algorithms include nearest-neighbor interpolation, which simply duplicates adjacent pixels for quick but basic enlargement, and bilinear interpolation, which calculates new pixel values based on the weighted average of surrounding pixels for smoother results. These methods upscale the cropped section to match the display or output resolution, but they cannot introduce new information, leading to potential artifacts if over-applied.[15][16] The foundational technology enabling digital zoom is the image sensor, typically a charge-coupled device (CCD) or complementary metal-oxide-semiconductor (CMOS) array, which converts incoming light into electrical charges across millions of photosensitive pixels arranged in a grid. CCD sensors transfer these charges sequentially to an output amplifier for high-quality, low-noise readout, while CMOS sensors integrate amplification and processing at each pixel for faster, more power-efficient operation. Pixels serve as the basic building blocks, each capturing light intensity to form the digital image that digital zoom then processes.[17][18] Digital zoom first appeared in early digital cameras during the 1990s, serving as a cost-effective alternative to complex optical zoom systems in compact, consumer-oriented devices that prioritized affordability and simplicity over premium hardware. This innovation aligned with the rise of accessible digital photography, allowing basic magnification without the mechanical complexity of moving lens elements.[19]

Mechanism of Operation

Digital zoom operates through a software-based process that simulates magnification without altering the optical hardware. The procedure begins by cropping the original image captured by the sensor to isolate a smaller central portion corresponding to the desired field of view, effectively discarding peripheral pixels to focus on the target area. This cropped segment, which contains fewer pixels than the full image, is then upscaled to match the original resolution using interpolation algorithms that estimate values for the newly introduced pixels. Finally, sharpening filters are applied to the interpolated result to counteract the inherent blurring introduced during upscaling, enhancing edge contrast and detail perception.[20][21][22] The core of the upscaling step relies on interpolation methods to fill in the gaps created by enlargement. Nearest-neighbor interpolation, the simplest and fastest approach, replicates the value of the closest pixel for each new position, preserving original pixel data but often resulting in a blocky appearance due to its lack of smoothing. In contrast, bicubic interpolation uses a 4x4 neighborhood of surrounding pixels to compute weighted averages, producing smoother gradients and reducing artifacts at the cost of higher computational demand; it has become a standard in image processing software and digital cameras for achieving visually acceptable enlargements. Bilinear interpolation serves as an intermediate option, averaging from a 2x2 pixel set for balanced speed and quality.[23][24][25] To mitigate the softness from interpolation, post-processing sharpening filters, such as unsharp masking, are commonly applied. These filters work by subtracting a blurred version of the image from the original to amplify high-frequency details like edges, thereby restoring perceived sharpness without introducing new information. This step is particularly essential in digital zoom pipelines to counteract the loss of fine details during the cropping and interpolation phases.[22][26] Implementing digital zoom, especially in real-time video streams, requires efficient processing to handle frame-by-frame operations without significant latency. On mobile devices, this demands optimized algorithms leveraging hardware accelerators like GPUs, as standard interpolation and sharpening can consume substantial cycles; for instance, bicubic methods may require up to four times the operations of nearest-neighbor per pixel. Modern smartphones achieve 30 frames per second digital zoom through vectorized computations and low-complexity filters, enabling seamless integration in consumer applications.[27][28] The magnification factor in digital zoom is defined by the ratio of the original image resolution to the cropped resolution, determining the effective zoom level $ z $:
z=RoriginalRcropped z = \frac{R_{\text{original}}}{R_{\text{cropped}}}
where $ R $ represents the linear dimension (e.g., width or height in pixels). For a 2x zoom on a 4000-pixel-wide image, the crop would be to 2000 pixels wide, halving the resolution before upscaling back to 4000 pixels; this process repeats for higher factors, amplifying the need for interpolation.[23][29]

Comparison to Optical Zoom

Key Differences

Digital zoom and optical zoom differ fundamentally in their hardware foundations. Digital zoom is a software-based process that requires no mechanical components, relying instead on the camera's image processor to manipulate the captured data. In contrast, optical zoom depends on physical hardware within the lens assembly, where multiple glass elements are adjusted—often via motors—to change the effective focal length and physically magnify the incoming light before it hits the sensor.[30][31] Functionally, digital zoom simulates magnification by cropping the central portion of the image sensor's output and then enlarging that cropped section through interpolation, which occurs either in real-time during preview or post-capture. This approach does not capture additional detail beyond what the sensor initially records at the base focal length. Optical zoom, however, alters the optical path pre-capture by repositioning lens elements to focus more light from the subject onto the sensor, achieving true magnification that enhances detail without software intervention.[30][1] Regarding output characteristics, digital zoom always compromises effective resolution, as the cropped area contains fewer pixels than the full sensor, necessitating artificial enlargement that can lead to visible degradation in sharpness and detail. Optical zoom preserves the sensor's full pixel count at every magnification level, delivering an image that retains the original resolution and optical fidelity. For example, in a 12-megapixel camera, 2x optical zoom employs all 12 megapixels to form the image, whereas 2x digital zoom effectively utilizes only about 3 megapixels from the cropped center before interpolation to match the output size.[30][32]

Advantages and Disadvantages

Digital zoom provides key advantages in cost and design efficiency compared to optical zoom. By relying on software processing rather than mechanical lens elements, it reduces manufacturing expenses, enabling its widespread integration into budget-friendly devices.[33] This approach also promotes compactness, as it eliminates bulky moving parts, making it ideal for slim profiles in smartphones and portable cameras.[34] Furthermore, its software foundation allows theoretically unlimited zoom levels without hardware limitations and facilitates seamless enhancements via firmware updates.[21] Despite these benefits, digital zoom suffers from inherent drawbacks in image fidelity. It achieves magnification by cropping the original image and interpolating new pixels, leading to inevitable quality degradation such as blurriness and pixelation, particularly at higher levels.[33] Unlike optical methods, it offers no improvement in light gathering, resulting in amplified noise and reduced detail in low-light scenarios.[21] Quantitatively, the effective resolution diminishes by the square of the zoom factor—for example, 4x zoom retains only 1/16th of the original pixels, sharply limiting usable detail.[35] These trade-offs position digital zoom as suitable for casual, quick snapshots in good lighting, where convenience outweighs perfection, but it falls short in professional contexts like low-light photography, where optical zoom maintains superior clarity and detail.[21]

Technical Limitations

Non-Deteriorated Zoom Limit

The non-deteriorated zoom limit in digital zoom represents the maximum magnification factor at which the enlarged image, achieved through cropping and interpolation, maintains visual fidelity without noticeable artifacts such as softening or pixelation becoming apparent to the human eye. This threshold occurs when the effective resolution of the cropped sensor area equals or exceeds the required output resolution, beyond which upscaling introduces degradation. Typically, for standard consumer sensors without advanced processing, this limit falls between 2x and 3x magnification before visible softening emerges under normal viewing conditions.[36][37] Several factors determine this limit, primarily the sensor's resolution in megapixels, which provides the pool of pixels available for cropping—higher resolutions, such as 48 MP or more in modern smartphones, permit greater zoom before pixel scarcity forces aggressive interpolation. The output or display resolution also critically influences the threshold; for example, targeting 4K video (approximately 8.3 million pixels) imposes a stricter limit than 1080p output (about 2 million pixels), as the former requires denser source detail to avoid upscaling.[38] The limit can be calculated using the approximation: zoom limit ≈ √(sensor pixel count / output pixel count). This formula arises because digital zoom reduces the effective pixel count by the square of the zoom factor (z²), as the cropped area scales linearly in both dimensions; to remain non-deteriorated, the cropped pixels must suffice for the output without interpolation beyond native data, yielding z ≤ √(S / O), where S is sensor pixels and O is output pixels. For instance, a 20 MP sensor (roughly 20 million pixels) viewed on a 1080p display allows approximately √(20 / 2) ≈ 3.2x zoom before degradation sets in.[38][35] In the 2020s, AI-driven super-resolution methods have substantially extended these limits in consumer devices. Techniques like multi-frame fusion and learned upscaling enable effective zooms of 5-10x with reduced perceptible loss, as seen in smartphones employing algorithms that align and enhance burst-captured frames. Seminal contributions, such as Google's handheld multi-frame super-resolution approach, underpin these advancements by leveraging computational photography to reconstruct details beyond traditional interpolation constraints. As of 2025, further progress includes the Chain-of-Zoom framework for extreme super-resolution up to 256x magnification without model retraining and quantized super-resolution optimized for mobile neural processing units (NPUs) to support efficient AI-based digital zoom in smartphones.[39][40][41]

Image Quality Degradation

Digital zoom beyond non-deteriorated limits primarily degrades image quality through several distinct artifacts, including pixelation, blurring, and increased noise. Pixelation manifests as blocky artifacts due to the cropping of the original image sensor data, which reduces the available pixel information in the zoomed region, followed by upsampling that fails to recover lost details. This loss of original detail in the cropped area is a fundamental cause, as digital zoom enlarges a subset of pixels without additional optical magnification, leading to visible blockiness especially at higher zoom factors. Blurring arises from interpolation methods such as nearest neighbor, bilinear, or bicubic upscaling, which estimate new pixel values but often smooth out edges and fine textures, resulting in softened details. Artificial pixel creation during this interpolation process can also introduce aliasing, appearing as zigzag patterns or moiré effects along high-contrast edges, particularly when anti-aliasing filters are inadequate. Additionally, increased noise and graininess become prominent, stemming from the amplification of sensor noise in small cropped areas with inherently low signal-to-noise ratios, exacerbating grainy textures in low-light conditions. In video applications of digital zoom, compression artifacts further compound these issues, as temporal encoding schemes like H.264 or HEVC struggle with the reduced resolution and interpolated frames, introducing blockiness and color banding during motion. These artifacts are particularly noticeable in real-time streaming or recording, where the combination of spatial upscaling and video compression amplifies distortions. To mitigate these degradations, software enhancements such as edge detection filters apply unsharp masking or Laplacian operators to emphasize boundaries and counteract blurring, though excessive use can lead to over-sharpening and ringing artifacts. More advanced techniques leverage AI-based super-resolution, employing neural networks to predict and reconstruct high-frequency details from low-resolution inputs; convolutional neural networks for wavelet-domain upscaling, introduced in research around 2017, marked a key advancement in this area. These methods gained traction in smartphones starting from 2017 onward, with multi-frame super-resolution algorithms merging bursts of raw images to enhance detail and reduce noise— for instance, kernel regression techniques in handheld systems achieve up to 2x effective zoom improvement on devices like the Google Pixel series by exploiting subpixel shifts from natural hand motion. Such AI approaches outperform traditional interpolation by learning patterns from large datasets, preserving structural integrity without introducing severe aliasing. Image quality degradation in digital zoom is quantitatively assessed using metrics like Peak Signal-to-Noise Ratio (PSNR) and Structural Similarity Index (SSIM). PSNR measures the ratio between the maximum possible signal and the noise introduced by degradation, expressed in decibels (dB), where higher values indicate better quality; for typical 8-bit images, acceptable PSNR ranges from 30 to 50 dB, but 2x digital zoom often drops this by 6-10 dB due to interpolation errors, pushing values below 30 dB and making artifacts perceptible. SSIM, ranging from 0 to 1, evaluates perceived structural changes by comparing luminance, contrast, and structure between original and zoomed images, with values above 0.95 denoting minimal degradation; digital zoom typically reduces SSIM to 0.85-0.95 at moderate levels, highlighting loss of textural fidelity over mere pixel error. These metrics provide objective benchmarks, though they correlate imperfectly with human perception in complex scenes.

Applications and Aesthetics

Use in Consumer Devices

Digital zoom has become a staple feature in consumer devices, particularly smartphones, where it is frequently integrated with optical capabilities to form hybrid systems. Apple's iPhone lineup, starting with the iPhone 7 Plus in 2016, pioneered this approach by combining a 2x optical telephoto lens with digital zoom for magnifications up to 10x, enabling seamless transitions between lenses for improved versatility in everyday photography and videography.[42] Compact cameras, such as the Sony Cyber-shot RX100 VII, extend their 8x optical zoom to a total of up to 32x combined zoom including digital and Clear Image Zoom, allowing users to capture distant subjects without bulky equipment.[43] Action cameras like the GoPro Hero series also incorporate digital zoom, with models such as the Hero 13 Black offering up to 2x digital zoom in video and time-lapse modes to adjust framing during dynamic activities.[44] The evolution of digital zoom in these devices reflects advancements in processing power and software. In the 2000s, early camera-equipped flip phones, like the Samsung SCH-V200 released in 2000, provided basic digital zoom capabilities limited by low-resolution sensors and simple cropping techniques.[45] By the 2020s, capabilities expanded dramatically, as exemplified by Samsung's Galaxy S20 Ultra in 2020, which introduced 100x Space Zoom—a blend of 10x optical quality zoom, hybrid processing, and AI-enhanced digital zoom to mitigate quality loss at extreme levels.[46] As of 2025, recent flagships like the Galaxy S25 Ultra continue this trend with refined 100x AI-enhanced zoom and improved electronic image stabilization for steady footage.[47] To enhance user experience, digital zoom integrates with features like burst mode and video stabilization in smartphones. Burst mode, available on devices such as recent iPhones, captures rapid sequences of images during zoomed shots, enabling selection of the sharpest frame from multiple exposures.[48] Video stabilization, often through electronic image stabilization (EIS), counters motion blur during digital zoom, as seen in Samsung Galaxy models. Market trends indicate widespread adoption of digital zoom in smartphones as of 2025, driven by AI algorithms marketed as "lossless" to simulate higher quality through super-resolution upscaling.[49] This prevalence underscores its role in making advanced imaging accessible, though it can still introduce minor quality degradation at higher magnifications.[50]

Visual and Artistic Effects

Digital zoom introduces visual impacts that alter the aesthetic character of images, primarily through a progressive loss of sharpness as magnification increases. This softening occurs because digital zoom relies on cropping and interpolating existing pixels, which blurs fine details and reduces edge definition, creating a diffused appearance rather than the crisp clarity achievable with optical methods.[51] At moderate levels, such as 2x, the effect is subtle and may preserve a natural look, but beyond this, the image can take on an ethereal, almost impressionistic quality due to the smoothing of textures.[51] In artistic applications, digital zoom offers creative potential for generating abstract effects, particularly in genres that embrace intentional degradation to evoke emotion or focus on composition over fidelity. For instance, photographers may apply high levels of digital zoom to produce stylized, low-resolution visuals that mimic pixel art or emphasize silhouettes and patterns, turning potential flaws into deliberate stylistic choices.[52] However, its limitations become evident in portraiture, where simulated bokeh—intended to isolate subjects with blurred backgrounds—often appears unnatural and blocky, failing to replicate the smooth, organic transitions of lens-based depth-of-field effects and thereby disrupting the intimate, realistic aesthetic desired in such work.[53] Perceptual studies highlight the human eye's tolerance for these changes, with degradation typically becoming noticeable to most viewers beyond 3x zoom, where sharpness loss and artifacts dominate subjective quality assessments.[51] In controlled experiments involving mobile-captured telephotos, mean opinion scores (MOS) dropped significantly at 5x zoom, indicating that while low-to-moderate digital zoom remains perceptually acceptable for casual viewing, higher magnifications exceed visual thresholds for detail retention.[51] To counter these aesthetic drawbacks, artists frequently employ creative workarounds in post-processing software like Adobe Photoshop, applying AI-driven upscaling via Super Resolution to restore resolution and detail in cropped regions, or using Smart Sharpen filters to selectively enhance edges without amplifying noise.[54] These techniques allow zoomed images to regain artistic viability, transforming technical constraints into opportunities for refined visual expression.

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  51. Super Resolution: An incredible new Tool in Photoshop
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