Re: ps6: new user
Re: ps6: new user
- Subject: Re: ps6: new user
- From: Andrew Rodney <email@hidden>
- Date: Sat, 17 Feb 2001 09:38:18 -0700
on 2/17/01 12:38 AM, taruntarun at email@hidden wrote:
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1) what setting do i use in proof color setup? i mean i have the cmyk
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profile for our printer but my RGB pictures look really horrible "very
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low contrast and dull grayish blacks(99% ones)" with "paper white and
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"black ink" "ON". it matches the print exactly with these options off.
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does this mean my monitor calibration is not correct.
What do you want to proof? If CMYK, you have the option of just picking CMYK
and whatever CMYK profile you have loaded in your color settings will be
used. If that's not the output space you want to soft proof, you have to go
into Custom and load the output profile (be it RGB or CMYK) and then you'll
be viewing the output for that device.
Paper White and Ink Black will (with an accurate profile of your display and
output device) produce a more accurate soft proof. A displays black and
white are not the same as an output devices black or white and the latter
info is contained in the profile. Display black is essentially the blackest
black your monitor can produce. When you turn on those options, Photoshop
alters the soft proof to take into account the black and white of the output
device and simulates that on screen. Now, the real problem is VIEWING this
happening! You should try and turn you head when invoking these options or
walk away from the display for awhile and then come back. The preview will
not look that ugly and it will actually be correct. It's watching the
preview change that is causing difficulties. FWIW, this is a similar
behavior of users when doing sharpening. Over sharpen a file using Unsharp
Mask then set it back to a more appropriate setting. Visually the image
looks unfocused or soft but it's really just the issue of cranking the USM
back to a better setting which causes you to visually think the image isn't
sharp enough. Bottom line is that the Paper White and Black Ink will be a
closer match to your output assuming good profiles. Just ignore the change
in the preview while the screen updates.
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) why should i use "relative colorimetric" or "absolute colorimetric".
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"relative colorimetric" gives good results but "absolute" looks like
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someone has changed the monitor setting from 6500k to 9300k. the
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neutrals just go bluish. is it only for CMYK to CMYK?
Absolute Colorimetric simulates the paper white using that info in the
profile. I'm not sure if your question is directed to viewing or actual
conversion. When you pick Paper White, the preview is using Absolute but you
could convert using another rendering intent. So we have two issues here;
preview and output. You would want to use Absolute Colorimetric for
conversions if you wanted to proof one output device onto another (a CMYK
Contract proof onto an Epson ink jet). Using this intent, the output on the
Epson would take the paper white of the CMYK contract proof into account and
lay down some ink to simulate the white of the contract proof. If you are
not doing this, I don't think you'd use Absolute to do a conversion for
output. I'm not sure why you say the differences are so large when you pick
Absolute. I'd start suspecting the quality of the profile.
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3) i always work on pictures so should i put my rendering intent in
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"color settings" to "perceptual".
Perceptual or Relative. There is no one right answer (although if you held a
gun to my head and I had to pick just one, I might pick Perceptual). Some
images will result in better output using one or the other depending on the
out of gamut colors in the file. What you can do is use the Convert to
Profile command in Photoshop 6 and toggle the two intents and visually see
which you prefer before committing on an intent.
Be cool if there was an automatic method of picking Relative verses
Perceptual based on the image itself. Well there soon will be in the "Make
it So" automate plug in. It can examine the image and pick the most
appropriate intent based on each image automatically and do so in a "batch"
mode with a folder of images.
Andrew Rodney