PPM Image Viewer (SDL2)

A minimal image viewer that reads PPM (P6) images from stdin and displays them using SDL2.
Built to stay close to the metal: raw file parsing, manual buffers, no image libraries.

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Supported Format

• PPM P6 (binary)
• maxval = 255 only

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Recommended Image Size / Ratio

PPM itself has no fixed or recommended aspect ratio — it’s just raw pixels.
That said, for sanity and performance:

• Recommended resolution: 800×600 or 640×480
• Aspect ratio: 4:3 or 16:9
• Avoid extremely large images (PPM is uncompressed and memory-heavy)

Best rule:
👉 Use a resolution that comfortably fits on screen and matches your SDL window.

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Setup & Build

Compile using SDL2:

gcc -o main main.c `sdl2-config --cflags --libs`

Then run :

cat image.ppm | ./main