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Author Topic: Blue Cast  (Read 10620 times)
rpara
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« on: February 17, 2013, 04:20:29 AM »

I printed an image with Qimage of some geese in a fairly deep patch of fog. I notice that part (and just part) of the fog area had a noticeable bluish cast.  I then printed the same image using Lightroom with the same profile, paper and ink.  The bluish cast did not show up in the fog area.  Anyone know what is going on?  The only difference In processing that I can identify is saving to a tiff file from Lightroom and the different types of sharpening.
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Fred A
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« Reply #1 on: February 17, 2013, 10:09:36 AM »

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I printed an image with Qimage of some geese in a fairly deep patch of fog. I notice that part (and just part) of the fog area had a noticeable bluish cast.  I then printed the same image using Lightroom with the same profile, paper and ink.  The bluish cast did not show up in the fog area.  Anyone know what is going on?  The only difference In processing that I can identify is saving to a tiff file from Lightroom and the different types of sharpening.

Good morning!
Let's start by saying that, "all things equal", same profile, same paper setting, same driver settings, same image, the prints will print the same from PS or Lightroom and Qimage (with Qimage having a decided edge on quality!)
Could you clarify, "The only difference In processing that I can identify is saving to a tiff file from Lightroom and the different types of sharpening."
Did you print a Tiff from Qimage and a processed RAW from Lightroom? If so, when the tiff was created, it could have been created with a different colorspace embedded.
If you used the same Tiff for printing both images, then check driver settings for OFF for Color management and all other settings...

Run your mouse pointer over the thumbnail of the tiff and the raw...(assuming the original was a Raw) and read the Hotbar at the bottom of the Qimage screen, left side.
It will show the embedded or not color space. See if they match.

What printer? What paper? What profile? What image mode was the original? 
In the Qimage editor, run your mouse pointer over the areas of the  fog from which you see blue. Check the RGB readings that show in the editor comparing the level of B in that area to the other parts of the fog.

Let's get some idea of what's going on.

It will work out!
Fred
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rpara
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« Reply #2 on: February 17, 2013, 04:35:13 PM »


Good morning!
Let's start by saying that, "all things equal", same profile, same paper setting, same driver settings, same image, the prints will print the same from PS or Lightroom and Qimage (with Qimage having a decided edge on quality!)
Could you clarify, "The only difference In processing that I can identify is saving to a tiff file from Lightroom and the different types of sharpening."
Did you print a Tiff from Qimage and a processed RAW from Lightroom? If so, when the tiff was created, it could have been created with a different colorspace embedded.
If you used the same Tiff for printing both images, then check driver settings for OFF for Color management and all other settings...

Run your mouse pointer over the thumbnail of the tiff and the raw...(assuming the original was a Raw) and read the Hotbar at the bottom of the Qimage screen, left side.
It will show the embedded or not color space. See if they match.

What printer? What paper? What profile? What image mode was the original?  
In the Qimage editor, run your mouse pointer over the areas of the  fog from which you see blue. Check the RGB readings that show in the editor comparing the level of B in that area to the other parts of the fog.

Let's get some idea of what's going on.

It will work out!
Fred

To answer your questions.

Yes, I printed a tiff image from Qimage and a processed RAW from Lightroom.  The tiff image was created from the file in Lightroom and there was no further processing in Lightroom.

The tiff file has the embedded colorspace Prophoto RGB which is also used in Lightroom.

The printer is an Epson 3880.  The paper is Moab Entrada Bright.  The profile used on both prints is one I created using a Colormunki Photo.  I'm not sure what an image mode is.  Could you explain?

The top of the fog area which prints out perfect on both has an RGB value of 252 253 253 in Qimage and 253 253 253 in Lightroom.  Just before entering the blue area, the RGB values are 245 245 245 in Qimage and 245 245 245 in Lightroom.  The middle of the blue area has an RGB value of 230 231 229 in Qimage and 231 231 231 in Lightroom.  Seems like both are very close and neutral.

I'll try to read the blue values on the print using the Colormunki.

Thanks a lot for your help!

Added:  The measured sRGB values in the middle of the (what I thought) blue area from the Colormunki are 223 231 226 which they say is a greenish-white.
« Last Edit: February 17, 2013, 05:00:12 PM by rpara » Logged
Fred A
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« Reply #3 on: February 17, 2013, 05:53:04 PM »

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I'm not sure what an image mode is

That was just my way of asking if the shot was taken in Raw mode.

Ok all we need to solve this is your RAW image and your printer profile.

You can send them to me using WETRANSFER, a free file transfer service.  The link is below.

https://www.wetransfer.com/

Send to wathree.ssz@verizon.net

Fred
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rpara
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« Reply #4 on: February 17, 2013, 07:30:35 PM »

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I'm not sure what an image mode is

That was just my way of asking if the shot was taken in Raw mode.

Ok all we need to solve this is your RAW image and your printer profile.

You can send them to me using WETRANSFER, a free file transfer service.  The link is below.

https://www.wetransfer.com/

Send to wathree.ssz@verizon.net

Fred

Transfered.  Thanks.

Printed with Qimage and without any sharpening.  Same blue cast. 
Imported tif file back into Lightroom and printed without any adjustments.  No blue cast.

« Last Edit: February 17, 2013, 07:34:49 PM by rpara » Logged
Fred A
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« Reply #5 on: February 17, 2013, 09:23:44 PM »

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Transfered.  Thanks.

Printed with Qimage and without any sharpening.  Same blue cast. 
Imported tif file back into Lightroom and printed without any adjustments.  No blue cast.

OK I have them, but for the record, one shows Adobe colorspace and the other RGB. I don't see any Prophoto.icc

Fred
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rpara
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« Reply #6 on: February 17, 2013, 10:09:12 PM »



OK I have them, but for the record, one shows Adobe colorspace and the other RGB. I don't see any Prophoto.icc

Fred

Sorry.  When I stripped the metadata it stripped the embedded profile.  I resent the tif file.  Looks like all dng files only report adobe icc (of the embedded jpg?).
« Last Edit: February 17, 2013, 10:34:24 PM by rpara » Logged
Fred A
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« Reply #7 on: February 17, 2013, 11:03:16 PM »

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Sorry.  When I stripped the metadata it stripped the embedded profile.  I resent the tif file.  Looks like all dng files only report adobe icc in Qimage and not what type.

I don't think I need it.

From what I can see, your printer profile is bad, very bad. It seems to attack grays more than the other colors, but it hazes everything along the way.
Look at the screen snaps.

086 and 084 are your image and my image using your profile.
Look at the posterizing and artifacts in the sky.

085 is my same sky using my profile
088 is your profile in the printer profile box of print properties.
Set yours like that, although it probably is already, and click select your thumbnail. Now Right click and toward the bottom of the menu it offers Softproof.
My screen snaps are what you will see.

Two more to follow.

Fred
« Last Edit: February 17, 2013, 11:35:27 PM by Fred A » Logged
Fred A
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« Reply #8 on: February 17, 2013, 11:04:33 PM »

This one is done in Photo Shop,

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rpara
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« Reply #9 on: February 18, 2013, 01:55:01 AM »


I don't think I need it.

From what I can see, your printer profile is bad, very bad. It seems to attack grays more than the other colors, but it hazes everything along the way.
Look at the screen snaps.


Fred

Thanks Fred!  That's the problem.  When I soft proof in Lightroom, Photoshop or Qimage with this profile, I get the same messed up colors.  With any other profile, the soft proofs look great.  Amazing though, that by printing somehow it was corrected perfectly in Lightroom and almost perfectly in Qimage.

I'll create another profile and see what happens.  I'm thinking I must not have turned off color management when creating the profile.
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