Posted: Fri Apr 04, 2008 5:40 pm Post subject: converting jpeg photo files to TIFF format
Hello-I'm taking the time to edit some of my nicer/older outdoor photos that were taken in jpeg format in Photoshop CS3 and then on to printing with an Epson 3800. I've been told that files I want to print I should make sure that I'm set to an RGB color space (1998), get icc profiles for paper, have photoshop manage colors, etc. This is all going great! However, I've recently read online that to truly show the full potential of one's photos, those jpeg's should be converted to a TIFF file format...especially when printing (I'm now taking everything in RAW format, but I still have to take care of some of these nicer jpeg's). Have done several prints comparing same photo in jpeg & tiff and tiff definately is higher quality. Now..my questions concern some of the settings in CS3 when I chose 'Save As' - 'Format' = tiff.
1st: in the first menu under 'Save Options' there is a check next to 'ICCProfile: sRGB IEC 61966-2.1. I'm assuming that I need to uncheck this box so it doesn't override my preference for RGB in the original? If I'm wrong on this PLEASE let me know! the other option for 'Color' shows my printer model and is greyed out so I can't check it.
2nd: I'm then choosing 'No Compression' ... large files or O.K. for me.
3rd: Under 'TIFF Options' , it is already set at 'Pixel order=Interleaved'. Is this O.K.? My other option is 'Per Channel' which is always left unchecked by Photoshop.
4th: There is a 'Save Image Pyrmid' left uncheck by Photoshop CS3..I haven't messed with this...Should I?
Joined: 24 Sep 2007
Posts: 3515
Location: Haverhill, UK PS Version: Lightroom 5, CS4 & Elements 11 OS: Windows 8.1
Posted: Sat Apr 05, 2008 4:04 am Post subject:
Hi johnnytsunami,
Converting a JPEG to a TIFF isn't going to improve the quality of the photograph, you'll essentially have a JPEG saved into a much larger TIFF container. When the JPEG was saved originally, that's when you lost some pixel definition to the JPEG compression scheme, by coverting to a TIFF now you'll not be able to bring back any more details, colour, tones etc.
In answer to your 4 questions-
1) RGB is a colour space. sRGB IEC 61966-2.1 is a variation of the RGB colour space. If the checkbox is asking you if you want to save with a sRGB IEC 61966-2.1 profile, that's its way of asking you if you want to save a tagged version of the currently assigned profile along with the document. A much more popular variation of RGB is the Adobe RGB (1998) colour space, generally speaking it has a much wider gamut that the standard version (sRGB IEC 61966-2.1).
The big advantage of assigning or converting to an Adobe RGB (1998) profile (Edit > Assign Profile/Covert Profile) is if you're going to be working on the image inside Photoshop, by which I mean applying curves adjustments to improve colour etc and then printing the document.
2) No compression is OK, but I prefer LZW compression. It's lossless and results in smaller file sizes.
3) The default is fine. Doesn't make too much difference for general purposes.
4) Leave this turned off, it'll just increase the file size with no real benefit.
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