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Terminal-image-viewer
Jul 20, 2023
Display images in terminals using RGB ANSI codes & unicode characters
Small C++ program to display images in a modern terminal using RGB ANSI codes and unicode block graphic characters.
There are various similar tools such as timg using the unicode half block character to display two 24bit pixels per character cell. This program enhances the resolution by mapping 4x8 pixel cells to different unicode characters, using the following algorithm
For each 4x8 pixel cell of the potentially downscaled image
- Find the color channel R, G or B that has the biggest range of values for the current cell.
- Split this range in the middle and create a corresponding bitmap for the cell.
- Compare the bitmap to the assumed bitmaps for various unicode block graphics characters.
- Re-calculate the foreground and background colors for the chosen character.
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