Lossless JPEG Optimizer
Another straight to the point solution
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Search results for "image"
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How to check if image was upscaled
Detecting low-quality images programatiacally
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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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How to make website load really fast?
Lots of tips and tools for website optimizations
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