27 lines
1.3 KiB
Markdown
27 lines
1.3 KiB
Markdown
## bmp2array4bit
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bmp2array4bit.py reads a bmp file, and creates C (or C++) code that contains two arrays for adding images to four-bit sprites. See [Sprite_image_4bit](../../examples/Sprite/Sprite_image_4bit) for an example.
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It is loosely based on Spark Fun's bmp2array script, https://github.com/sparkfun/BMPtoArray/blob/master/bmp2array.py. The bmp file format is documented in https://en.wikipedia.org/wiki/BMP_file_format.
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You'll need python 3.6 (the original uses Python 2.7)
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`usage: python bmp2array4bit.py [-v] star.bmp [-o myfile.c]`
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Create the bmp file in Gimp (www.gimp.org) from any image as follows:
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* Remove the alpha channel (if it has one)
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Layer -> Transparency -> Remove Alpha Channel
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* Set the mode to indexed.
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Image -> Mode -> Indexed...
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* Select Generate optimum palette with 16 colors (max)
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* Export the file with a .bmp extension. Do **NOT** select options:
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* Run-Length Encoded
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* Compatibility Options: "Do not write color space information"
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* There are no Advanced Options available with these settings
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(There are other tools that will produce bmp files, and these should work provided you don't use run-length encoding or other advanced features).
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The first array produced is the palette for the image.
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The second is the image itself.
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