Color Cast on printed images

JW
Posted By
JP White
Dec 26, 2003
Views
618
Replies
11
Status
Closed
I was fortunate enough to have a color printer as a gift this Christmas, a Canon i475D.

Prints out of it are not as represented on the screen (I do have my monitor calibrated), so I tried to find out where the problem lies. I flattened and converted the image to CMYK and threw away the color profile. On printing in PS7 I told it under color management to allow the printer to color manage. I thought by doing this PS would leave at all up to the printer and I could then tweak the printer settings. However the images come out with a yellow color cast.

As another experiment I saved the image as a PDF file and had Acrobat print the image, *NO* color cast – in fact it looked half decent (short on saturation maybe , but no cast).

So my question is, if I told PS to allow the printer to manage the color how is the yellow cast creeping in? If the print driver were at fault then I should get a color cast from Acrobat too!. PS is obviously ‘doing’ something. How can I setup PS to leave the image alone and let me tweak the printer settings only?

The Canon comes with 7 cryptically named ICM files, anyone know what they are for? (The documentation doesn’t even mention them).

JP

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TH
Tom Harrison
Dec 26, 2003
Try this site here
http://www.computer-darkroom.com/ps7_print/ps7_print_mac.htm

Tom

"JP White" wrote in message
I was fortunate enough to have a color printer as a gift this Christmas, a Canon i475D.

Prints out of it are not as represented on the screen (I do have my monitor calibrated), so I tried to find out where the problem lies. I flattened and converted the image to CMYK and threw away the color profile. On printing in PS7 I told it under color management to allow the printer to color manage. I thought by doing this PS would leave at all up to the printer and I could then tweak the printer settings. However the images come out with a yellow color cast.

As another experiment I saved the image as a PDF file and had Acrobat print the image, *NO* color cast – in fact it looked half decent (short on saturation maybe , but no cast).

So my question is, if I told PS to allow the printer to manage the color how is the yellow cast creeping in? If the print driver were at fault then I should get a color cast from Acrobat too!. PS is obviously ‘doing’ something. How can I setup PS to leave the image alone and let me tweak the printer settings only?

The Canon comes with 7 cryptically named ICM files, anyone know what they are for? (The documentation doesn’t even mention them).
JP
JW
JP White
Dec 26, 2003
Tom Harrison wrote:
Try this site here
http://www.computer-darkroom.com/ps7_print/ps7_print_mac.htm
Tom

Thanks for the link, it points out a few things I am doing wrong straight off the bat. Hopefully I can select the right options now!

JP
P
Phil
Dec 29, 2003
On Fri, 26 Dec 2003 20:16:54 -0000, "Tom Harrison" wrote:

Try this site here
http://www.computer-darkroom.com/ps7_print/ps7_print_mac.htm
Tom

"JP White" wrote in message
I was fortunate enough to have a color printer as a gift this Christmas, a Canon i475D.

Prints out of it are not as represented on the screen (I do have my monitor calibrated), so I tried to find out where the problem lies. I flattened and converted the image to CMYK and threw away the color profile. On printing in PS7 I told it under color management to allow the printer to color manage. I thought by doing this PS would leave at all up to the printer and I could then tweak the printer settings. However the images come out with a yellow color cast.

As another experiment I saved the image as a PDF file and had Acrobat print the image, *NO* color cast – in fact it looked half decent (short on saturation maybe , but no cast).

So my question is, if I told PS to allow the printer to manage the color how is the yellow cast creeping in? If the print driver were at fault then I should get a color cast from Acrobat too!. PS is obviously ‘doing’ something. How can I setup PS to leave the image alone and let me tweak the printer settings only?

The Canon comes with 7 cryptically named ICM files, anyone know what they are for? (The documentation doesn’t even mention them).
JP
Their advice is to set the color profile in the Print With Preview window; you can also do this with Image/Mode/Assign Profile, in which case you’ll see the color shift required to match up properly to the printer/paper combination.
F
Flycaster
Dec 30, 2003
"Phil" wrote in message
On Fri, 26 Dec 2003 20:16:54 -0000, "Tom Harrison"

Their advice is to set the color profile in the Print With Preview window; you can also do this with Image/Mode/Assign Profile, in which case you’ll see the color shift required to match up properly to the printer/paper combination.

The color shift you see is not what you think it is. You need to Convert to Profile, not Assign to Profile, to do this correctly. By simply assinging, the underlying color numbers are mapped directly to the new profile space, with no attempt to keep the colors similar. God only knows what will come out of the printer, but it certainly will not look like your original file! OTOH, converting to profile *shifts* the underlying color numbers before mapping them to the new profile space, thus preserving the original colors (as best the profile can make them using whatever rendering intent you have chosen).

Also, FWIW, no consumer Canon printer on the market today comes with true ICC profiles. They are certainly capable of being profiled (I’ve made quite a few very nice Canon paper profiles for friends and clients), it’s just that Canon hasn’t gotten aboard the profile wagon yet by shipping their printers with independent canned paper profiles that can be used for soft-proofing.

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P
Phil
Dec 30, 2003
On Mon, 29 Dec 2003 20:15:26 -0800, "Flycaster" wrote:

"Phil" wrote in message
On Fri, 26 Dec 2003 20:16:54 -0000, "Tom Harrison"

Their advice is to set the color profile in the Print With Preview window; you can also do this with Image/Mode/Assign Profile, in which case you’ll see the color shift required to match up properly to the printer/paper combination.

The color shift you see is not what you think it is. You need to Convert to Profile, not Assign to Profile, to do this correctly. By simply assinging, the underlying color numbers are mapped directly to the new profile space, with no attempt to keep the colors similar. God only knows what will come out of the printer, but it certainly will not look like your original file! OTOH, converting to profile *shifts* the underlying color numbers before mapping them to the new profile space, thus preserving the original colors (as best the profile can make them using whatever rendering intent you have chosen).

Also, FWIW, no consumer Canon printer on the market today comes with true ICC profiles. They are certainly capable of being profiled (I’ve made quite a few very nice Canon paper profiles for friends and clients), it’s just that Canon hasn’t gotten aboard the profile wagon yet by shipping their printers with independent canned paper profiles that can be used for soft-proofing.

Yes, the correct procedure is to "Convert to Profile." This is also the proper way to profile images prior to having prints made on Noritsu/Frontier processors. Funny though, "assigning" creates a very bluish screen image that then prints properly on matte paper (Epson). So what is the "Assign to Profile" option actually used for?
N
nomail
Dec 30, 2003
Phil wrote:

Yes, the correct procedure is to "Convert to Profile." This is also the proper way to profile images prior to having prints made on Noritsu/Frontier processors. Funny though, "assigning" creates a very bluish screen image that then prints properly on matte paper (Epson). So what is the "Assign to Profile" option actually used for?

To assign a profile to an image which does not have a tagged profile, but you know which one it should be. Say that you know that the image is in AdobeRGB color space, but for some reason it has lost its tagged profile. You could then assign AdobeRGB profile to it. Most (if not all) cosumer digital cameras are in sRGB, but many cameras do not tagg the images with a profile.


Johan W. Elzenga johan<<at>>johanfoto.nl Editor / Photographer http://www.johanfoto.nl/
F
Flycaster
Dec 31, 2003
"Johan W. Elzenga" wrote in message

To assign a profile to an image which does not have a tagged profile, but you know which one it should be. Say that you know that the image is in AdobeRGB color space, but for some reason it has lost its tagged profile. You could then assign AdobeRGB profile to it.

Righto.

Most (if not all)
cosumer digital cameras are in sRGB, but many cameras do not tagg the images with a profile.

It seems that most consumer digicams that don’t have RAW capability do, in fact, either tag those files with sRGB, or use that color space to define the color numbers. RAW files, otoh, are output in the camera’s native color space which (at least in the case of my D60) appears to be larger than even ARGB98. I say "appear" because I have not quantitatively measured it, but it is certainly larger than sRGB.

I’m not a big fan of sRGB, nor is anyone that works regularly in CMYK, or with modern 6-7 color inkjets.

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F
Flycaster
Dec 31, 2003
"Phil" wrote in message
Yes, the correct procedure is to "Convert to Profile." This is also the proper way to profile images prior to having prints made on Noritsu/Frontier processors. Funny though, "assigning" creates a very bluish screen image that then prints properly on matte paper (Epson). So what is the "Assign to Profile" option actually used for?

John did an excellent job of answering that question for you. Usually the only time you’d ever need to do this is when you open an untagged file for the first time.

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H
Hecate
Dec 31, 2003
On Tue, 30 Dec 2003 17:08:29 -0800, "Flycaster" wrote:

I’m not a big fan of sRGB, nor is anyone that works regularly in CMYK, or with modern 6-7 color inkjets.
Yes. I only find the colour space useful when I know I’m only producing an image for web use and *definitely* don’t want to print it.



Hecate

veni, vidi, reliqui
F
Flycaster
Dec 31, 2003
"Hecate" wrote in message
On Tue, 30 Dec 2003 17:08:29 -0800, "Flycaster" wrote:

I’m not a big fan of sRGB, nor is anyone that works regularly in CMYK, or with modern 6-7 color inkjets.
Yes. I only find the colour space useful when I know I’m only producing an image for web use and *definitely* don’t want to print it.

Either that, or when I occasionally send stuff to Costco which uses a Fuji photoprinter that employs sRGB by brain-dead default.

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H
Hecate
Jan 1, 2004
On Tue, 30 Dec 2003 19:29:52 -0800, "Flycaster" wrote:

"Hecate" wrote in message
On Tue, 30 Dec 2003 17:08:29 -0800, "Flycaster" wrote:

I’m not a big fan of sRGB, nor is anyone that works regularly in CMYK, or with modern 6-7 color inkjets.
Yes. I only find the colour space useful when I know I’m only producing an image for web use and *definitely* don’t want to print it.

Either that, or when I occasionally send stuff to Costco which uses a Fuji photoprinter that employs sRGB by brain-dead default.
The printer or Costco? 😉



Hecate

veni, vidi, reliqui

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– in 4 materials (clay versions included)

– 12 scenes

– 48 MacBook Pro 16″ mockups

– 6000 x 4500 px

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