Does Flickr recompress JPEGs after upload? I know that if you upload a TIFF, for example, Flickr converts it to JPEG. But do they also compress incoming JPEGs?
I've read some complaints about the quality of the JPEG compression used on Flickr. I'm just wondering if it makes sense to upload TIFFs and let Flickr to the conversion or to upload a high quality JPEG in the hopes that Flickr doesn't recompress it.
Answer
If you upload a JPEG, Flickr does not modify the Original-size image in any way, apart from changing the filename.
I tested it out by uploading a full-size, 100% quality JPEG to Flickr then re-downloading the Original size image and comparing it with the original (using a comparison tool called Beyond Compare). The two files are identical, byte for byte. That means not only has the image not been compressed but all the original metadata (Exif etc.) is also intact.
I also tested a TIFF and the Original image on Flickr is a JPEG. So in the case of TIFFs, they are compressed. (All JPEGs are compressed so some extent, even if you choose 100% quality - hence the size difference between JPEG and an equivalent TIFF.)
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