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OTA bitmap
OTA Bitmap (Over The Air Bitmap) was a specification designed by Nokia for black and white images for mobile phones.
The OTA Bitmap was defined by Nokia as part of their Smart Messaging specification, to send pictures as a series of one or more concatenated SMS text messages. The format has a maximum size of 255x255 pixels. It is very rare for an OTA bitmap to measure anything other than 72x28 pixels (for Picture Messages) or 72x14/72x13 pixels (for Operator Logos). The specification contains a byte of data to be used for indicating a multicolour image. This was to future-proof the standard, but the advent of MMS meant it never got to implementation.
The OTA Bitmap format is a monochrome, uncompressed format using one bit per pixel. As the format was designed for cellular phones, there is no standard computer format. It may be stored as a binary file or as hex (usually without spaces) in a text file. Recognized extension is .otb.
Before the image itself there is a header. The header is four bytes wide. A typical example is:
00 48 1C 01. These are:
Other possibilities may be: 00 48 0E 01 (for 72x14 bitmaps), 00 48 0D 01 (for 72x13 bitmaps).
After the header the image itself starts. This example will use the following 72x28 pixel image.
The first 8 pixels, reading right from the top left hand corner are one white (0) followed by seven blacks (1111111), giving the first byte, in Binary, as 01111111.
Converting from the binary 01111111 to hex, results in the first byte that represents the pixels (7F). The next 8 characters are 8 blacks (11111111 or FF) and so on.
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OTA bitmap AI simulator
(@OTA bitmap_simulator)
OTA bitmap
OTA Bitmap (Over The Air Bitmap) was a specification designed by Nokia for black and white images for mobile phones.
The OTA Bitmap was defined by Nokia as part of their Smart Messaging specification, to send pictures as a series of one or more concatenated SMS text messages. The format has a maximum size of 255x255 pixels. It is very rare for an OTA bitmap to measure anything other than 72x28 pixels (for Picture Messages) or 72x14/72x13 pixels (for Operator Logos). The specification contains a byte of data to be used for indicating a multicolour image. This was to future-proof the standard, but the advent of MMS meant it never got to implementation.
The OTA Bitmap format is a monochrome, uncompressed format using one bit per pixel. As the format was designed for cellular phones, there is no standard computer format. It may be stored as a binary file or as hex (usually without spaces) in a text file. Recognized extension is .otb.
Before the image itself there is a header. The header is four bytes wide. A typical example is:
00 48 1C 01. These are:
Other possibilities may be: 00 48 0E 01 (for 72x14 bitmaps), 00 48 0D 01 (for 72x13 bitmaps).
After the header the image itself starts. This example will use the following 72x28 pixel image.
The first 8 pixels, reading right from the top left hand corner are one white (0) followed by seven blacks (1111111), giving the first byte, in Binary, as 01111111.
Converting from the binary 01111111 to hex, results in the first byte that represents the pixels (7F). The next 8 characters are 8 blacks (11111111 or FF) and so on.