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 03/03/2006 07:54:02 AM · #1
I need some help with getting rid of the blue color casting in the background. I've tried going through the tutorial to get rid of it, but I'm not having any luck.

This happens every time I photograph something yellow.



P.S. I've done no post-processing on this yet, other than to resize it for posting.

Thanks in advance for any help you can offer!

George
 03/03/2006 08:06:24 AM · #2


Here is my go at it - but......

The image was almost perfect once I balanced levels in PS, however, since I have some time right now I went further. I brought sat up in yellow range and down in blue range, increased contrast a tad, decreased brightness, removed digital noise, sharpened, then painted over the yellows with an almost transparent yellow brush just to give the yellow some pop. Its a bit overdone, but gives you some ideas.
03/03/2006 08:34:19 AM · #3


Under Hue/saturation adjust the blue channel to a hue that was closer to what you were really seeing, and then adjust the lightness and saturation accordingly.

Hope that helps a little. :)

edit:hit enter to fast.....

Message edited by author 2006-03-14 18:03:49.
 03/03/2006 08:42:38 AM · #4
Other things to try:
1. Enhance > adjust color > color cast
-or-
2. In your levels adjustment dialogue box use the droppers to set white point, black point, and grey points.
-or-
3. Use additive color....make a solid color layer and set it to color dodge (or color burn) experiment with different colors and vary the opacity.
 03/03/2006 05:48:49 PM · #5
Here's my go at it...slight desat. on background, brought all whites forward and sat. the foreground slightly.

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 03/03/2006 06:26:59 PM · #6
Thank you very much for your responses ladies :)

Originally posted by idnic:
Here is my go at it - but......

The image was almost perfect once I balanced levels in PS,...


How did you balance the levels? I usually use "auto levels".

Originally posted by notesinstones:
Under Hue/saturation adjust the blue channel to a hue that was closer to what you were really seeing, and then adjust the lightness and saturation accordingly.

Hope that helps a little. :)


I hadn't thought of that one, but I would be "coloring" it wouldn't I? I was hoping to be able to recapture the original colors. :(

Originally posted by KaDi:
Other things to try:
1. Enhance > adjust color > color cast
-or-
2. In your levels adjustment dialogue box use the droppers to set white point, black point, and grey points.
-or-
3. Use additive color....make a solid color layer and set it to color dodge (or color burn) experiment with different colors and vary the opacity.


1. Which software has "Enhance > adjust color > color cast"? Is there a trial version I can download?
2. That's what I tried ( from the tutorial ) and it didn't work :(
3. hadn't tried that one either, but again, I'd be coloring it, which I'd like to stay away from.

I'd really like to re-capture the original colors (like in the tutorial), but I'm starting to think that I'm up the creek.

Thanks again for your responses! :)

Anybody else who might have an idea as to how I can get the original colors back, I'd greatly appreciate hearing from you! :)

George
 03/03/2006 06:41:07 PM · #7
it would help to know what the original colours were that you are trying to achieve.
 03/03/2006 06:51:05 PM · #8
Originally posted by Prism:
it would help to know what the original colours were that you are trying to achieve.


yes and what software are you using now?
edit- & what tutorial are you trying?

Message edited by author 2006-03-03 18:51:54.
 03/03/2006 06:54:27 PM · #9
not sure what you are looking for...so, I did this the way I would like it...



I hope you like it...

Phillip
 03/03/2006 08:06:30 PM · #10
Oh! Sorry, I'm using Photoshop CS. The tutorial is How to Remove a Color Cast by moodville.

I believe the original background colors were browns and greens.

In a nutshell, here's what the problem is...

Problem:
Every time I photograph something yellow, the background is tinted blue. (Is that a color cast? If it is, then there's got to be a way to remove it. Right?)

Solution I'm hoping for:
A way to remove the blue tint on the background so it will display the original colors. (in this case, probably browns and greens)

Now, the tutorial removes a color cast from a snake and the original colors of the snake shine through. That's what I want for the background. Is it possible??

Thanks so much for your patience. :)

George
 03/03/2006 08:18:32 PM · #11
what's going on is your camera thinks the yellow is white & throwing the whole color cast off. I don't know about the tutorial but it seems to me that is you select the background you can make it a layer (Control+J) and work on it seperately with your tutorial without changing the flower.

You can select the background using the pen or select color.

If I were you tho- I would do two layer adjustments. (ying yang sign at bottom) one levels & one selective color. make sure your selective color is set to absolute for best results... just play with them & see what you get...
 03/03/2006 08:26:47 PM · #12
part of the problem IMHO is auto-levels. Auto anything in PS is evil...
manually set black point white point and then levels...

If your cam is turning greens blue then there has to be something set up wrong with the camera

03/03/2006 08:29:09 PM · #13
Ok, that makes sense. :) I'll give that a try and see what happens.

Thanks WonderBread, much appreciated!

George
 03/03/2006 08:38:44 PM · #14
Are you using flash and is the background in shadows? outside? Could be the reason the background is turning blue (shady areas usually have a blue tint).
I tried some color adjustments but the backround is still blue unless I create a green color to the petals.
03/03/2006 08:41:07 PM · #15
here is my shot on this ...

found white and black points using threshold adjustment layers
set white and black points in levels (I dont do gray unless it is super critical)
did hue/saturation selected blues from the dropdown and shifted the hue toward green
then selected yellow and brought up the saturation a bit...

could use a pop of contrast and some GEM (like Neat Image but by kodak and MUCH cleaner)

added: there is a bit of a blue edge that I would clone out around the northeast petals

Message edited by author 2006-03-03 20:43:41.
 03/03/2006 08:52:56 PM · #16
pcody:
This was taken outside with no flash. I'm almost positive the background wasn't in shadow.

nomad:
did selecting the threshold change anything at all for you? It didn't seem to do much when I tried it.

I agree about the contrast and grain. I haven't done any post processing on it as yet... I'll pp it and post the completed version sometime tomorrow. :)

G
 03/03/2006 09:02:09 PM · #17
Originally posted by ggbudge:
pcody:
This was taken outside with no flash. I'm almost positive the background wasn't in shadow.

nomad:
did selecting the threshold change anything at all for you? It didn't seem to do much when I tried it.

I agree about the contrast and grain. I haven't done any post processing on it as yet... I'll pp it and post the completed version sometime tomorrow. :)

G


I use the threshold adjustment layers only to find the EXACT black and white point

here are the steps

new adjustment layer (just ok the dialog that comes up)
when the histogram comes up pull it to the left until the last blob of black in on the image and ok it

that is your black point (use the color sampler tool to mark it)

Now delete that adjustment layer

Create another threshold adjustment layer and do the above steps EXCEPT move to the right. The last blob of white on the image is the white point. (be sure to delete that adjustment layer also

Now when you do your levels you can select the exact white and black points instead of groping in the dark for them

Message edited by author 2006-03-03 21:03:50.
 03/03/2006 09:12:27 PM · #18
Just curious. Do you use auto wb?
 03/03/2006 09:47:11 PM · #19
Originally posted by ggbudge:
I need some help with getting rid of the blue color casting in the background. I've tried going through the tutorial to get rid of it, but I'm not having any luck.

This happens every time I photograph something yellow.

Before: ... After Level Adjustments:

I'm surprised that no one has suggested this but it looks like your white balance setting is incorrect. Appears to be set for florescent lighting. You might want to check that on your camera.

I tried doing color balance adjustments to correct it but went with a straight levels adjustment after reviewing this:
Solving Color and White Balance Problems

I don't think I got it corrected yet, but you can read the theory at the link and try for yourself.
03/03/2006 10:37:36 PM · #20
Originally posted by ggbudge:

Originally posted by KaDi:
Other things to try:
1. Enhance > adjust color > color cast
-or-
2. In your levels adjustment dialogue box use the droppers to set white point, black point, and grey points.
-or-
3. Use additive color....make a solid color layer and set it to color dodge (or color burn) experiment with different colors and vary the opacity.


1. Which software has "Enhance > adjust color > color cast"? Is there a trial version I can download?
2. That's what I tried ( from the tutorial ) and it didn't work :(
3. hadn't tried that one either, but again, I'd be coloring it, which I'd like to stay away from.



1. photoshop elements 2
2. setting points may be just 1 step on the way. i often have more than one "levels" layer working. i correct the gross settings, then create another layers level to deal with white point, etc. But, i'm working in elements which does not have "curves"
3. i agree, you're right to stay away from artificial color enhancements...but there are some tricks that work sometimes...this one i'm just learning about this week...if i come up with anything good i'll share

looks like you opened up a great discussion here and received some valuable tips!
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