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Author Topic: printer filter  (Read 25181 times)
Gian
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« on: June 26, 2012, 06:12:04 PM »

hi All,

I have tried to remove a magenta cast with the printer filter, setting Red -2 or -10 in white balance.

However, I cannot see any difference.

What could I have done wrong?!

ciao,
-Gian
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Terry-M
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« Reply #1 on: June 26, 2012, 07:22:39 PM »

Hi Gian,
Quote
I have tried to remove a magenta cast with the printer filter, setting Red -2 or -10 in white balance
Reducing Red in White balance will make the image "cooler" towards blue but not really affect magenta.
You'd be better using the saturation feature, un-tick the lock, select magenta and apply a negative value: 0 to -100 is available.
Alternatively, you could use the Select Color feature (SEL COL tab) but that requires a bit of practice to use!
How about getting back to first principles and Colour Management. Is your monitor calibrated, are you using a printer profile for the printer, paper and ink combination you are using?
If you do not have a printer profile, use Qimage set to "Let Driver manage Color". Read the help under Color management for advice on driver settings.
Terry
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Terry-M
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« Reply #2 on: June 26, 2012, 09:04:40 PM »

Follow up
Quote
setting Red -2 or -10 in white balance. However, I cannot see any difference.
The amounts you mention for adjusting in White Balance are very small.
See attached image below that was way out on WB, notice that it required +52 red and -29 Blue to correct it in the editor - quite large numbers!
Terry
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Gian
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« Reply #3 on: June 27, 2012, 07:31:22 PM »

Terry,

thanks for your kind reply.

I do not know much about color management, so I have a lot to learn.

In fact, I was experimenting, and was surprised to see no effect.

I will try your advice, and do some homework.

Anyway, I had my monitor hardware calibrated, and I am using the correct profile for my Epson printer and paper.

-Gian
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Terry-M
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« Reply #4 on: June 27, 2012, 07:46:03 PM »

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Anyway, I had my monitor hardware calibrated, and I am using the correct profile for my Epson printer and paper.
So to understand your problem correctly, do your images look right on your monitor and only the prints have a magenta cast - or do the images look bad on screen too?

If it's only the prints that have the magenta cast and you are using a monitor and printer profile, I suggest you look for the source of the problem and not try to correct it with a print filter.
There are some possibilities:
1. The printer driver is not set correctly - it should be ICM and "no color adjustment". Tell us what printer you have and the settings being used. Attach some screen shots.
2. Qimage is not set correctly: is the printer profile set and enabled, again, attach a screen shot?
3. This may sound silly but is a common problem - do a nozzle check and make sure the test pattern is complete - a blocked nozzle will affect the colours.
4. Are you using genuine Epson inks: an Epson profile probably will not work with so called "compatible" inks?

Terry
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Gian
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« Reply #5 on: June 27, 2012, 08:39:22 PM »

Terry,

I am testing right now.

I prepared three filters, with Magenta -20, -40 and -60.

I printed a stormy sky that shows no magenta on screen.
There is no difference between unfiltered and M-60.

The settings for my R800 are Icm, NoColorAdj, monitor profile, Epson PremGlsyBstPhoto.
Only original inks, recently cleaned nozzles, no striping or other visible defects.

Considering that the monitor is profiled, my goal is to print accordingly.

One question, though.
The image I'm printing is Adobe RGB 1998.
Could that matter?

thanks for your help,
-Gian
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Terry-M
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« Reply #6 on: June 27, 2012, 08:59:59 PM »

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I prepared three filters, with Magenta -20, -40 and -60. I printed a stormy sky that shows no magenta on screen. There is no difference between unfiltered and M-60.
Have you saved the filter with a unique name? On your screen shot, the Print Filter box is not ticked. When that is done you will be prompted to select a filter file.

Quote
The settings for my R800 are Icm, NoColorAdj, monitor profile, Epson PremGlsyBstPhoto.
That's good, I have an R800 too and get superb prints that match my monitor extremely well and there's no reason why you should not get the same.
Quote
Only original inks, recently cleaned nozzles, no striping or other visible defects.
BUT .. have you printed a nozzle check pattern just before you print - look at it carefully, clean until the pattern is perfect, no breaks.
Sorry to go on about it, but I cannot see any other reason for getting a magenta cast on your prints.

Quote
The image I'm printing is Adobe RGB 1998. Could that matter?
No, it should not. Qimage is fully colour management aware. There is a possibility that the image is not tagged in its exif data or the Adobe profile is not embedded.
You can check by hovering you mouse over the thumbnail and read what it says in the exif bar at the bottom of the screen; it's the last item in the data.
If it does not show Adobe RGB and says sRGB, it's as I said not exif tagged or embedded. Yo can override the image icc profile in the filter screen to correct it - near the bottom of the adjust tab.
This is unlikely to give a magenta cast, just make the image look dull overall.
Terry

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Gian
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« Reply #7 on: June 27, 2012, 09:32:09 PM »

Yes, the filters have unique names and were saved.
You don't see the tick because I wanted to double check the M-60 print, so I removed the filter and re-printed.

I am sure it *should* work fine.
I like the quality of the prints, but because I did not get the same colours printing a large format in a lab, I had the monitor calibrated.

I know I could pop in fresh inks to restore the original quality, but I am just puzzled that I cannot tweak the colours with the filters.
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Terry-M
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« Reply #8 on: June 27, 2012, 10:21:21 PM »

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I am just puzzled that I cannot tweak the colours with the filters.
Do you see a difference in the image on screen when you make the filter?
Terry
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Gian
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« Reply #9 on: June 28, 2012, 04:44:35 AM »

no, I don't.
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Terry-M
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« Reply #10 on: June 28, 2012, 06:49:03 AM »

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no, I don't.
If the sky is basically neutral then a magenta saturation of -60 probably will not make much difference.
Could you see the difference when using the White Balance changes?
I tried your values here on an image with a grey sky and the difference was considerable. I'm confident enough in my process to know that a print would reflect this.
I see from your screen shot that it is some time since your monitor was calibrated - probably worth doing again. How was this done before?
Terry.
« Last Edit: June 28, 2012, 07:03:31 AM by Terry-M » Logged
Fred A
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« Reply #11 on: June 28, 2012, 09:13:33 AM »

Terry, Gian

Perhaps Gian can email the image to you...... problem solved in 5 minutes!!
Also, turn off the Monitor profile, select a pixel in the Qimage editor and read the RGB values. Write them down.
Look at the lower right in the Editor for Pixel position. Select (example) 2000 x 200. (Easy to remember.) That should put you in the sky.
Write down the RGB values.... Now turn on the Monitor profile.
Do the same test on the same pixel, 2000 x 200.
Write those numbers down.
What did you get?

Fred
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Terry-M
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« Reply #12 on: June 28, 2012, 09:34:26 AM »

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Perhaps Gian can email the image to you...... problem solved in 5 minutes!!
I've e-mailed Gian with my address.
Terry
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Gian
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« Reply #13 on: June 28, 2012, 09:16:19 PM »

Fred,

I can't seem to find an editor with a colour picker tool, are we talking about QI-Pro?
I have setting to define an external editor, that's it.

Terry,

I don't know why the monitor profile was named like that, but I am sure that the calibration is not older than 10 days.

Will try Fred advice as soon as I work out where is the Qimage editor...
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Fred A
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« Reply #14 on: June 28, 2012, 09:27:09 PM »

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Will try Fred advice as soon as I work out where is the Qimage editor...

The oldest I have is an old Studio, but fairly certain you have the same interface in PRO
See screen snap.
Open the Editor screen to the tools as shown.
At the bottom of the tool box, you see Pixel Position and Current Color

Fred
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