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What is the best format for pictures?
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<blockquote data-quote="XCorvis" data-source="post: 2211674" data-attributes="member: 1265"><p>Woah, calm down.</p><p></p><p>Image size does not equate to file size. An image that appears very small might actually be quite large in terms of the amount of data it requires. You're probably making very high-quality images. The setting you're looking for is labled DPI (or possibly PPI), meaning dots per inch (or pixels per inch). I bet it's somewhere between 300-600. Change the physical dimensions to what you want, the reduce the DPI to 72. This will dramatically decrease the file size. Now save the file as a jpeg or png. (Don't use gif, it's not free.) </p><p></p><p>Jpeg and png file formats have built-in file compression, to make the file size smaller. However, Jpeg compression is lossy, meaning it throws away data to make the file smaller. PNG compression is lossless - it keeps all the data.</p><p>If you use jpeg, choose the compression level you want, but know that the more you compress, the worse the image looks. Put it at 90% to start, see if the image looks OK. Now check the file size. (On Windows, right click on the file and select properties.) If the file size is OK and the image quality is OK, upload it. Otherwise, go back and save it with either increased or decreased compression. I don't know what the file size limits on ENWorld are.</p><p></p><p>For png, just save it and check the size. If it's still too big, go back and reduce the dpi again.</p><p></p><p>If you've already used image compression with a jpeg file make sure you DON'T use it for anything else. Toss it and go back to an earlier saved version. Once you save with lossy compression, you can't ever improve the quality, so make sure you only use it for your final version. (It's ok to use a file saved with no compression or "lossless" compression - it's still at the original quality level. PNG is lossless.)</p><p></p><p><em>Edit: corrected, png is lossless, not lossy.</em></p></blockquote><p></p>
[QUOTE="XCorvis, post: 2211674, member: 1265"] Woah, calm down. Image size does not equate to file size. An image that appears very small might actually be quite large in terms of the amount of data it requires. You're probably making very high-quality images. The setting you're looking for is labled DPI (or possibly PPI), meaning dots per inch (or pixels per inch). I bet it's somewhere between 300-600. Change the physical dimensions to what you want, the reduce the DPI to 72. This will dramatically decrease the file size. Now save the file as a jpeg or png. (Don't use gif, it's not free.) Jpeg and png file formats have built-in file compression, to make the file size smaller. However, Jpeg compression is lossy, meaning it throws away data to make the file smaller. PNG compression is lossless - it keeps all the data. If you use jpeg, choose the compression level you want, but know that the more you compress, the worse the image looks. Put it at 90% to start, see if the image looks OK. Now check the file size. (On Windows, right click on the file and select properties.) If the file size is OK and the image quality is OK, upload it. Otherwise, go back and save it with either increased or decreased compression. I don't know what the file size limits on ENWorld are. For png, just save it and check the size. If it's still too big, go back and reduce the dpi again. If you've already used image compression with a jpeg file make sure you DON'T use it for anything else. Toss it and go back to an earlier saved version. Once you save with lossy compression, you can't ever improve the quality, so make sure you only use it for your final version. (It's ok to use a file saved with no compression or "lossless" compression - it's still at the original quality level. PNG is lossless.) [i]Edit: corrected, png is lossless, not lossy.[/i] [/QUOTE]
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