Jpeg is a compressed file. Tiff is an uncompressed file. When you open a jpeg in PhotoShop, the software decompresses the file, restoring it to original size. On Jun 15, 2006, at 9:30 PM, Shel Belinkoff wrote:
> 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 > -- PDML Pentax-Discuss Mail List [email protected] http://pdml.net/mailman/listinfo/pdml_pdml.net
