Lossless JPEG Optimizer
Another straight to the point solution
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Detecting low-quality images programatiacally
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How to convert PDF to HTML or TXT?
Extracting text from PDF in a few lines of code
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How to open TGA images in PHP and save as PNG
Working with TGA textures in PHP
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How to open PSD/DDS/BMP images in PHP
Image conversion from various formats
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