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Have you tried using the resample process in Pixinsight? it provides you with different interpolation algorithm options and some control over how they are applied. I don't understand the maths behind it all but it seems to be the best-suited process in Pixinsight.
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Hi everyone,I'm considering submitting some of my recent images to AAPOD2. However, I've encountered a hurdle. They have a 10MB upload limit, whereas my image file sizes range between 13MB and 60MB. I'm seeking a method to compress my PNGs without losing quality. I've already tried some websites like TinyPNG, but they also have an upload limit. I do not know anything about how AAPOD2 handles images. But I can provide you advice from Salvatore Iovene relating to AB, but also with some good general advice. He is suggesting not to use PNG files for astroimages and that 95% quality jpgs are his recommendation, as they do not typically show compression artificats. Have you tried saving as a jpeg and see what it looks like. On AB tiffs are converted to jpegs for proper rendering in most browsers. The only other suggestion I have is to contact AAPOD2 and get their suggestions. I find it odd but there doesn't seem to be any guidance on their site on image formats, size requirements, compression that is accepted, or recommendations. Rick  |
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