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Here are some technical details that I've learned in the last few months.
- Higher resolution is always better.
- Repeated lossy compression is evil.
- Always keep the original.
- Set your digital camera to the highest resolution possible.
- Set the JPEG compression to the highest quality possible.
- Always upload the original, uncropped image first. Someone else might want to crop it differently.
- Don't use Photoshop or the Gimp to crop a JPEG file. The remaining part of the image will lose quality. Instead, use jpegtran, which can do various lossless transformations.
- Use pnmpsnr to verify that two images are identical, for example when converting TIFF to PNG.
- Use pngcrush to losslessly reduce the size of a PNG file.
- Use pnmcrop to crop a diagram to its bounding box.
- Choose a good name for your image.
- Avoid CamelCase.
- For an artwork, use the title.
- Otherwise, use something descriptive.