Changing Purple to Blue

MM
Posted By
Mike_Morrell
Jun 27, 2004
Views
1742
Replies
7
Status
Closed
I’m got some images where what should be dark blue is purple. What is the best way to make the image more blue and less purple?

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RK
Rob_Keijzer
Jun 27, 2004
Mike,

First make sure it’s not your monitor. (run Adobe Gamma). Then, if it is colour correction; find something in the image that ought to be some shade of gray. Then use the middle eye dropper in the Curves panel to correct it.

If, on the other hand, you want to shift the colour linearly towards blue, then use the channel mixer and take out some red and green.

Try to do all this on a new layer, so the original remains.

Rob
MM
Mike_Morrell
Jun 27, 2004
My monitor is calibrated pretty well, although I should recalibrate again as it has been some time. My prints for these images are also coming out purple so my monitor is matched frailly well with my printer.

Rob, if using the channel mixer, do I take out the red and green out of the blue channel?
B
BobLevine
Jun 27, 2004
If you haven’t calibrated your monitor yet, do it.

If you have:
What image mode is the picture in? RGB? CMYK? What printer are you printing to?

Bob
MM
Mike_Morrell
Jun 27, 2004
Working in RGB. The prints are matching my monitor so the monitor is calibrated OK. Prints are the same on Epson 2200 and R800 on glossy and matte paper. Its not all prints, just a few pictures that I cannot get color corrected properly in photoshop.
RM
Raymond_McKinley
Jun 28, 2004
Mike

What seems to be happening to your pictures is that you have come up against a printer limitation. The deep blues tend to print purple because the inks cannot cope with those colors. Purple is really a shade of magenta and the color which neutralizes magenta is green. Since your monitor is giving you an accurate preview of the print, you can bring up curves, select the green channel, ctrl click the purple area and move the green curve until the purple color shifts back to blue.

Raymond
MM
Mike_Morrell
Jun 28, 2004
Thanks Raymond, I’ll try this method.
AC
Aaron_Cramer
Jun 30, 2004
you can also use image>adjustments>selective color, go to blues (make sure absolute is checked at the bottom) and drag back the slider on the magenta bar.

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