Re: Embedded Profiles in Photoshop6
Re: Embedded Profiles in Photoshop6
- Subject: Re: Embedded Profiles in Photoshop6
- From: Joel <email@hidden>
- Date: Wed, 12 Sep 2001 09:46:12 -0500
Kevin Shapiro wrote:
(clip)...it mentions that when I save a file in Photoshop, that the
profiles (That I have checked, [rgb, cmyk, etc..]) will be embedded
in the file.
That is a PS 5.x option. In PS6 the embedding option is always on and
may be unchecked in the File>Save dialog box. RGB files embed RGB,
CMYK files embed CMYK, Lab files embed Lab, Grayscale embeds
grayscale. Unchecking embeds nothing and your files end up with a
color-by-numbers definition difficult for users and applications to
determine origin by. It is the color palette for your file. In other
words: turning off embedding is the first step to 'not' managing your
color.
It does not mention if the profiles are only saved in Photoshop
files, or any filetype that I save when saving the file using
photoshop. For example, will TIFF or TGA or JPG files saved from
photoshop contain these embedded profiles? (I don't think so, but I
need to verify that ONLY photoshop files have these profiles).
PSD, PS eps, jpeg, tiff, PICT, DCS all support embedding. TARGA no...
Also, when I scan files, I want the stored file to be of the highest
quality. So I have been saving them as 600DPI scanned TIFFs. If I
want to use the color management, and it has to be done through PS6
filetypes, is the Photoshop filetype going to be of the same quality
image as if I saved it as a "TIFF" file? I don't know if I lose
qulity storing it as a PS6 ("psd"?) file.
DPI depends on your required storage purposes and ultimate
destination for the file. For press line screen purpose multiply the
final linescreenx2 (i.e. 133 linescreen = 266 dpi, 150 linescreen =
300dpi, etc). As some color geek pointed out the other day, 3000 to
4000 ppi is near about all existing apps and devices can utilize in
today's workflows. In dpi terms we (me) recommend (for storage
requirements) scanning within 20% of the final, best quality largest
file output requirement and saving in the highest of the following
dpi steps (as space requirements allow): 600dpi, 450dpi, 300dpi,
266dpi, 150dpi. This is for fine art, large format reproduction and
archiving which may end up going to sheetfed press. Your needs may be
quite different and, off the top (assuming here), 600dpi may be
excessive depending on the actual document size. i.e.: a 600dpi 8x10
is equal to a 300dpi 16x20, a 150dpi 32x40, a 75dpi 64x80 and so on.
The quality of PSD and TIFF formats is the same. PSD supports the
saving of certain types of adjustment layers/channels/text layers
etc. TIFF and EPS are the most common workflow export file types.
Also check out:
http://www.adobe.com/support/forums/main.html
the Photoshop forum and the color management forum (link is to the
right side of the screen)
caio
--
joel johnstone - designtype
Winnipeg Manitoba Canada
(Gray zone thinking about black and white questions)