Sinclair QL SCR viewer
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Add more screen modes considering the following information:
Info by Dilwyn Jones
As higher resolution screens don't include width and height dimensions, you have to guess the width and height based on file sizes corresponding to common screen dimensions, e.g. 640x480 pixels (76800 bytes), 800x600 pixels (120000 bytes), 1024x768 pixels (196608 bytes).
PIC files have the 10 bytes before the graphics data, holding:
word - ident $4AFC word - width in pixels word - height in pixels word - line increment (number of bytes from start of one line to the next) byte - mode number byte - spare, unused