Something I've noticed before, and in light of the wonderful explanations Godders has provided about JPEG and TIFF files, it seems like as good a time as any to bring it up.
Taking an image shot in highest quality JPEG on the DS results in a file size of 1,900kb. Doing absolutely nothing to it but converting to a TIFF results in a file size of 17,600kb. Converting that file to 16-bit doubles the size. Now, making the same shot using RAW results in a file size of about 10,000kb, and converting it to TIFF results in a file size of approximately 35,000kb. I've noticed the same behavior with my little Sony. It will produce a TIFF and a JPEG simultaneously, and when the JPEG is converted to a TIFF it's the exact same size as the original TIFF. Further, when viewing a high quality JPEG in Photoshop, it shows the file size in the status bar to be about the same as the TIFF TIFF (or PSD) file made from that JPEG. So, if JPEG loses, or throws away, a lot of information, why are the files when converted to TIFF (or PSD) so large? Where does the extra info come from? And why does Photoshop show the smaller JPEG file to be the size of the larger TIFF or PSD file. Shel -- PDML Pentax-Discuss Mail List [email protected] http://pdml.net/mailman/listinfo/pdml_pdml.net
