Color Channel - All digital images consist of pixels that are made up of primary colors. Basically the channel is one component of a color image.
color channel
One of the numerical elements used to specify a color in a particular color model when that color is specified using an ordered n-tuple.
Additional color channel used for storing masks and selections
Alkaline
standard, non-rechargeable batteries ...
Tweaking each color channel with Hue/Saturation
Toning a B &l W image with Hue/Saturation colorized ...
The individual color channels method is best used for special cases where the color histograms have significantly different shapes. This method can easily cause color shifts in the image.
We can do a levels adjustment to shift the histogram but the pixels that originally were 0 or black on all color channels, even if moved to RGB numbers of 10 to 40 on all color channels, will still not have any texture or detail.
color channels mode makes work with color adjusting professional and flexible
auto modes for levels and contrast functions makes great-looking results with a single click ...
Each pixel in the image has a numerical value of between 0 and 255 and is made up of three color channels. So for example a pixel could be 37-red, 76-green and 125-blue and it would then look like this .
Creating Complex Masks Using Color Channels
Grassy Meadow
Color Range can help make short work of difficult selections, provided there is enough color difference between the object you're aiming to select and the rest of the image.
Here we're comparing the breakdown of noise in shadow areas by color channel. The crops below show the full color crop from our black patch and directly below this the contents of Red, Green and Blue color channels.
In Photoshop's Preferences, uncheck the Color Channels in Color box under Display and Cursors. Each RGB channel now will display in black-and-white, as if the scene was shot on black-and-white film through a red, green or blue filter.
Any color can be produced by adding the colors of the three color channels RGB (Red, Green, and Blue). If the colors of two of the color channels are mixed in equal proportions, new base colors are created.
BELOW: To make a contrast mask, you can select a color channel (here, we selected the Red Channel); then you can adjust the contrast within that channel to refine the mask as we have in the Red Contrast image.
use whatever process you prefer to convert your image to B/W (but do so while maintaining the color channels)
open up the channels palette (that's one of the tabs you'll see on the top of your History palette) ...
It's made up of three color layers representing the Red, Green, and Blue color channels. When all three layers overlap this is marked with gray color. If only two RGB channels overlap then cyan, magenta and yellow appear.
It usually uses an 8 to 16-bit per color channel storage method without losing image data. A disadvantage is that it creates very large files. Typically an image from a 3-megapixel camera will take up more than 9Mb of space on your storage card.
It's white, indicating "clipped" highlights in all three color channels. It represents the sky and the reflections on a couple of windows in the background. No detail there and nothing to recover.
In LAB color, you have a lightness channel (L) and two color channels (A,B). This makes it possible for us to change the colors in a picture without affecting the brightness.
Change to LAB mode by selecting Image -> Mode -> Lab Color in Photoshop.
This tutorial will focus on some of the creative controls that ACR provides, allowing you to stylize your images without learning complex masking or color channel techniques. The first thing is to click on the HSL / Grayscale panel button.
It is easy to see that no light (0R+0G+0B) produces complete darkness, black, and that full light (255R+255G+255B) produces white. Equal intensity on all color channels produces a level of gray. That is why there can only be 256 gray levels in GIMP.
In an RGB image (with a of 24) each pixel can be any one of 16.7 million colors/tones. Each pixel is made up of three color channels (Red, Green, & Blue) and each channel can be any one of 256 levels of tone (256 x 256 x 256 = 16,777,216) ...
Now stare at the image until your eyes are about to bulge out (just kidding - kids, don't try this at home) and see if you can see any color imbalances. Is the image too red, green or blue? If so, go to the color channel menu on the top of the ...
From basic adjustments in shadows, highlights and mid tones, to sophisticated adjustments at any point within a 256 (from 0 to 255) tonal range of the entire image or precise adjustments to the individual color channels of an image.
color curve
a graphic mechanism for displaying color measurements and for making color changes to an image. User adjustments to the angle and slope of the curve implement color changes to one or all of an image’s color channels.
You can get rid of it in a photo-editing program that lets you remove a color channel, desaturate the image, or convert it to gray scale. If your images are too dark, use your photo-editing program to expand their tonal range.
Check your histogram, and make sure all 3 color channels are properly exposed.
Post-process your photo, adjusting levels to get the proper amount of contrast.
 See also: Channel, Color, Image, Light, Camera
|
