scanner and color space

  • Thread starter Thread starter diapo_5400_II
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diapo_5400_II

Hello,

To backup your positive and to scan o make prints, do ou use RGB ou
adobe RGB color space. I intend to scan and so to save a jpeg.

Regards
 
thank you. Can a CRT monitor reproduce the colors that are in the adobe
but not in the sRGB ?

Regards
 
I'd suggest you save a TIFF instead, regardless of what colour space
you use. The JPG format produces smaller files, because it has
compressed the data. However unlike GIF or PNG, the compression is
done in a destructive way - you can never get back to the original. As
a result rather 'interesting' things can happen if you resize a JPG.
Store the scan as TIFF, work on it into copies, and when you finally
have what you are happy with save it as a JPG.
 
Hello,

What i'm used to do is :

scan 16 bits tiff in sRGB -> photoshop edit -> jpeg sRGB

I hesitate to now scan 16 bits tiff adobe 98 RGB -> photoshop edit -> jpeg
adobe 98 RGB

Do we see any difference on a trinitron pc monitor ? on a TV ? on the
online labs prints ?

Because we work in adobe 98 in place of sRGB, but using the same 24bits
definition, is there logically any more color moderations in the sRGB
colorspace using sRGB than in the sRGB colorspace using Adobe 98 files ?


Regards
 
diapo_5400_II said:
Hello,

To backup your positive and to scan o make prints, do ou use RGB ou
adobe RGB color space. I intend to scan and so to save a jpeg.

Regards
Click to expand...
I use Adobe RGB as my working space. Hence, I save the image in Adobe RGB.
To print, I use a profile for my printer, inks, and paper. The resultant
spool file is neither Adobe RGB nor sRGB.
I also use a profile for my monitor; hence PS does not send either Adobe RGB
nor sRGB to the monitor.

One should note that the gamut for many printers exceeds the gamut of sRGB.
Hence, if you are only sending sRGB to the printer, you are forcing PS to
make approximations of some colors.
Jim
 
diapo_5400_II said:
Hello,

What i'm used to do is :

scan 16 bits tiff in sRGB -> photoshop edit -> jpeg sRGB

I hesitate to now scan 16 bits tiff adobe 98 RGB -> photoshop edit ->
jpeg adobe 98 RGB
Click to expand...

Inasmuch as you're scanning at 16 bits, I also recommend saving as a TIFF,
which could be a compressed TIFF.
Do we see any difference on a trinitron pc monitor ? on a TV ? on the
online labs prints ?
Click to expand...

I believe you would see a difference on the monitor - I don't know about the
TV. As to online labs prints, it depends on what color management (if any)
they use - if they accept and honor AdobeRGB images, then yes, you would see
ad difference.
Because we work in adobe 98 in place of sRGB, but using the same
24bits definition, is there logically any more color moderations in
the sRGB colorspace using sRGB than in the sRGB colorspace using
Adobe 98 files ?
Click to expand...

I'm not clear as to what you're asking.

Maris
 
Maris V. Lidaka Sr. said:
Inasmuch as you're scanning at 16 bits, I also recommend saving as a TIFF,
which could be a compressed TIFF.
Click to expand...

Is the compressed tiff better using the same compression ratio ?
I'm not clear as to what you're asking.

Maris
Click to expand...

I mean that if you work in a 8 bit layer (24bits). Because the adobe RGB gamut
is larger than sRGB, the Adobe 98 definition is lower, isn't it ?

Thank you for your help.
 
Compressed TIFF is better than what? A compressed TIFF contains all of the
information in a TIFF image, just in a smaller file size. TIFF compression
is what is called "lossless". A compressed TIFF is better than a compressed
JPEG - compressing a JPEG causes it to lose information.

I'm guessing that your asking, in the 2nd part, whether colors end up more
muted in AdobeRGB than in sRGB because more colors are in the AdobeRGB
gamut. A non-issue IMHO - there are more colors in each of these color
spaces than the eye can distinguish, so that even though the 'color-spread'
so-to-speak covers a larger area in AdobeRGB, you can and will get the same
result - the difference will be in the colors 'at the edge', which you can
now get by using AdobeRGB but which are outside the sRGB gamut.

Take a look at the color gamut maps/plots at

http://www.digitaldog.net/files/GamutMaps.pdf

Then back up and read up some more at color guru Andrew Rodney's website at

http://www.digitaldog.net/tips/index.shtml

Maris
 
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