Photoshop :: Channels And Colors
Apr 17, 2007
Why is it that in an RGB colored red rose, the red channel is very light in color and the blue and green channels are very dark (near black), even though there is relatively little blue are green in the colored (RGB composite) version of the vibrantly colored red rose? This seems to be counter intuitive. When I look into the red channel, I would expect to see dark density to reflect the dominance of the red channel and lightness in the blue and green channels to reflect their relative absence in a red rose.
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Oct 31, 2013
What I'd like to do [in photoshop] is treat 4 pantone colors just like CMYK channels. What I mean by that is that I would like to replace Cyan, Magenta, Yellow and Black with my own colors [pantone colors] and have them mix and act exactly like those channels. As in, when I open a full color image, and my pantone [or any color] channels or color profile is active, the full color image will react to those colors [with the blending of the colors].
Instead of 45% Cyan, 55% Magenta, 83% Yellow, and 2% Black in a given spot, it would be a mix of the 4 chosen colors [example: 45% pantone A, 55% Pantone B, 83% Pantone C, 2% Pantone D].
or to put it another way, if I were to color the background in, say, a blue, I would be able to use the "Info" panel to see how much of each pantone color was mixed to create that color. Obviously there would be a limit to the colors I could create based on the pantone colors I select.
I don't want to do anything printing wise with this technique. I am looking at it solely as an on screen viewer or perhaps use it in some manner for screen printing.
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Jun 29, 2006
What are they used for? I have been using PS for around 3 years primarly for web design and I have never used channels outside of loading a selection. I searched for more info; I mostly got tutorials that use alpha channels, but no real explanation as to what they primarly do.
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Jun 28, 2012
I recently installed CS5 on my laptop after first removing it from my previous machine.All licences were validated so no problems there.Now when using paint bucket in Photoshop, the colors that I select in the color picker are not the colors that result when I use the paint bucket.
If I create a new black canvas then the colors selected in color picker work with paint bucket.But if I attempt to recolor the background in an existing image that I import into Photoshop, I get the mismatch with colors when I use paint bucket. My method for selecting colors is the same in each case, I select 'set foreground color' and set the color using html values entry at the bottom of the panel.
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Jul 7, 2013
Just wanted to print a new photo and realized that the colors in print preview do not match the colors in soft proofing. In both cases I selected the same icc profile and rendering method. The print colors matched the colors in print preview. I never had a problem so far. All new prints will be checked with soft proofing and adjusted when necessary. I never paid attention to the color rendition in print preview and all prints perfectly matched the colors from the soft proofing. I was surprised when my print came out of the printer and the colors weren't matching the soft proofing colors, but that of the print preview.
I don't understand why Photoshop renders the colors differently in the first place. See attached screenshot for the difference in the blue/cyan colors. I don't care if the print view colors will match the print, but I do care when soft proofing is not working.
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May 8, 2006
I am trying to edit this picture, and i find my desired results by manipulating the channels (removing the blue and leaving the green and red so it looks as if the whole thing has been tinted yellow), but when I save it as a JPEG, the yellow is gone, leaving all RGB. How can I keep it with my yellow?
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Mar 27, 2003
I guess sometimes teaching newbies like me is annoying. I could take the easy way ripping like most of the people does, but i do really want to learn, and i have a question, so if someone thinks tht spending his time teaching a fool newbie is something worth, thr it goes...
I know when we have an image even it is using "RGB" or "CMYK" collor mode, it is divided in channels, red, green, blue and so... this i can understand quite clear, but wht exactly is an alpha channel??? wht collor it represents??? Wht is it for??? Is there an article tht i could read about it??? I can manage it well, but i'd like to know it's concepts..
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Jul 20, 2004
I have been using the Total Training series, and am ALMOST complete (Just gotta go over the Typeface tool area and go over the Bonus disc material)
One area that Deke (the host of the series) didn't get into much was Channels. Hopefully I would like to state how I see them, and if I am incorrect in any way (or if you have useful information about channels), you could pipe in and let me know! Thanks.
Ok, so channels are dependant on the Color Mode you are in, right? If you are in RGB, then you'll have 4 channels. Red, Green, Blue, and the channel which controls them all, called RGB. In CMYK color mode, you'll have 5. Cyan, Magenta, Yellow, Black, and the control channel 'CMYK'.
Each channel, aside from the control channels, are a Grayscale mapping of that color's (WHAT?) in an image? It's Lightness? Saturation? I know it couldn't be Hue, because that's determined by the collective color from each channel put together.
Also, what is the point in ADDING channels? I thought that it would be nice if you could add a channel which affected the layer via some kind of adjustment, but that is merely the adjustment layer feature (with mask used in order to define intensity of the effect on that layer) So what is the point in adding channels?
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Apr 29, 2007
I have a question about channels.
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Jun 21, 2008
Masking using Channels and tried on one of my images.
When i select "Channels" option, i am getting a image which looks like looking through a RED, BLUE and GREEN filter. It is not showing the images in various greyscale modes as shown in the tutorials. There is a red or blue or green color cast on the image.
Is there any setting i need to select when using these options?
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Oct 30, 2004
Many times when I am doing something in Channels the black and white image(s) look better than if I converted the RGB image to grey scale. I have been experimenting with no luck. Is there a way for me to select one of the red, green or blue images and make it a final image that I can alter and save in PS?
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Sep 9, 2013
i have a picture where the Blue channel is totaly black and noise, so i to know if is possible delete this and create a copy a of the green or red channel and apply this as blue channel ?
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May 14, 2013
I am trying to convert an image that I took in SlideBook using fluorescent dyes to label proteins on a cell. The original image has two channels (red and green) with different intensities for each which correspond with the amount of each respective protein present. The problem is when I open the image in PS and convert it to RGB mode, all three of the channels have the same intensities so I get a black image. If i vary the contrast I can see the image but it is in black and white and the intensities of each channel are the same so I am unable to separate the two colors. I need to be able to see both channels (red and green) with their original intensities but I cannot figure out how!
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Feb 17, 2013
Using CS5 - up until yesterday was able to select RGB in Channels panel separately.
Today when I go into channels I can select Blue, Green or Red separately, but when I go to select RGB on it's own, it won't - it highlights that and the three seperate channels. I can turn the 'eye' icon on and off all of the others but not RGB.
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Nov 4, 2013
In my Camera Raw 6.7, when using the Tone Curve, the RGB channels are grayed out and can not be switched on, probably because the Raw Defaults are missing.
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Jan 10, 2013
I have about 7 channels that need merging together so I can save the file as a JPEG
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Nov 5, 2004
I have my alpha channel and my blue channel selected. I LOVE THIS IMAGE. how do I get that image over to my layers?
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Dec 23, 2002
In some tutorials they make selections and store them into a channel. In others they use the pen tool and store the selection as a path.
Are these two ways or doing the same thing or they have different uses?
What are the pros and cons of each one?
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Jun 10, 2007
I need to convert an image to Grayscale in CS2, but I need to retain my RGB channels. I need them because a special bump map tool that I have, which also converts images to DDS format, requires them. And I need to make my bumpmaps with this tool because of the special format that dds files require for the game I am using these textures in.
I've been using the Photocopy filter, but I feel it leaves the image a bit "dirty." I'd like a clean Grayscale conversion.
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Sep 20, 2002
blending 3D pictures(w/ black blackground) into another 2D picture with alpha channels in that 3D picture. Everytime I try to copy and paste under LOAD Selection, i get the 3D picture stuck with the black background or totally white with no picture when paste onto the 2D picture. I want to paste the 3D picture(minus the black background) to blend into 2D picture.
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Apr 17, 2009
I have a logo that I like, but I can't figure out how to change the colors of it. I tried to go to the channels where I saw RGB, Red, Green, and Blue channels. Is it possible to change these channels, thereby changing the colors?
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Dec 19, 2006
I have a picture I'd like to Extract. So far I have lightened it and cropped it. I have also had a look at Russell Browns QT tutorial, but I don't quite understand about channels. As far as I can see, I would benefit from using the Red Channel perhaps, but I would like your opinion on it.
Also, while I do Extract it, I'd like the image as large as possible, but once I click "Extract", the picture becomes much smaller. If I keep it as big as it is now, it will be OK, but probably not if I resize it.
At the moment, the picture is quite big, and I don't know how to get it down in size (kb) and still keep it physically big enough for you to view it. I know I can save for web, but even then, it won't go down to 75KB. What Width etc. should I set it to?
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Jul 15, 2005
alpha channels, and how to use them?
how can i apply the alpha channel to the original to get all the green stains out?
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Nov 15, 2002
Been messing around with using gaussian in the channels and then applying the texture to something, but this grainy texture keeps sneaking in.
Anyone know how to get rid of the "bumps" in the middle? I made a square, blurred it, messed with the levels a bit, then I contracted the selection to darken the center. Just in case that information might help .
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Oct 9, 2004
I was playing around with lighting images today by first creating an alpha channel, blurring it and then applying the lighting effects filter to it. For some reason after applying the filter I get jagged edges everywhere. When working with the channel, i did invert the selection and then clear it...
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Jan 10, 2005
I am unable to use the Search in Photoshop Help. This has not been a problem in the past. I did however recently load SP2 but really don't remember if this feature worked following that download.
Also, while doing a tutorial one of the steps indicated that the channel visiblity should be turned on and used. When I went to the channels palette this was not available. I have Photoshop 6 and it's quite possible that this feature came later. Is there anyway of changing the visiblity of an individual channel.
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Jan 6, 2004
The colors of pictures is much darker when working in photoshop than when I open it normally. And vice versa, I work on images inside photoshop, and I get the colors I want, but once I save it to bmp or jpg or anything else, all the colors are much lighter.
i'm using photoshop 7.
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Aug 14, 2013
select multiple channels and duplicate them all at once like you can with layers? As of now I'm having to select each channel and duplicate one by one. Once I select more than one the duplicate option becomes grayed out.
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Aug 12, 2013
I need to know how to save an individual color channel. I am able to split the channels, but they are in gray and not color. How would I save them in color? My PS is CS5.
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Jun 9, 2012
I've been working with the tutorial link below to get rid of some stains, While I have no problem working directly on the channels, I'm lost as to what it means to drag the channels onto layers. I can't seem to find a reference as to how to do this. Most likely I don't have to correct term when I'm searching.
"I normally drag the channels out onto layers to make the repairs. This gives much more control, especially if graduated masks are required. On this occasion and for the sake of simplicity I've made the repairs directly on the channels."
Tutorial Link [URL].....
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Apr 26, 2013
What is the maximum number of DCS channels that can be used? I have a file I saved as DCS 2.0 with Black and four spot channels, no problem.
When adding a fifth channel, that channel shows with a white background even though I made a selection of only what was being used and pasted that in.
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