The usefulness of YCbCr mostly comes down to saving bandwidth during data transmission over the air. The same standards from ITU can be used to convert between RGB and YCbCr images. If you are interested in these conversions you can refer to another article’s Manual Pixel Manipulation section which uses Recommendation 601 and 709 to convert between RGB and grayscale images. Technically RGB is losslessly convertible to YCbCr and vice versa. This is an attempt to adjust the light relative to the color since human eye is more sensitive to light differences and less sensitive to color differences. This sort of color difference is sometimes also called chrominance.Ĭhroma means color intensity or saturation or vividness of a color that’s why YCbCr’s Y component is also called Achromatic and Cb and Cr are the chromatic components.Īnother important point about YCbCr is that Y component in this mode is non-linear. In other words, Cb channel of YCbCr is an axis between green-blue (or Y-B) while Cr channel of YCbCr is an axis between green-red (or Y-R). Cr represents red in relation to chroma (green) component.Cb represents blue in relation to chroma (green) component,.Y stands for Luma component which is the light,.Yet another color mode YCbCr uses a different numerical method to represent colors. Screen pixels magnified under microscope (300x).Obviously we’re talking about tiny micro structures. Interestingly, each pixel on your screen consist of 3 lamps (red-green-blue) and every time a digital image is projected on your screen each pixel’s color is controlled through the values that control these three lamps. use RGB mode because this method of color production is more convenient for physical production of these devices. Most electronic devices such as monitors, TVs, phone screens, projectors, wearable tech, car dashboards etc. ![]() RGB images can be saved as a number of file types such as: jpg, png, gif, bmp, tiff, tga etc. Since each of these three values for each pixel can take any value between 0 and 255, RGB images are also 24-bit images. It’s probably safe to say that RGB images are the most common ones in use. Each of these values represent one of the channels of RGB color mode which are red, green and blue. RGB images can take 3 values for each pixel. In premultiplied alpha case: 127, 127 (La)Īlpha is already premultiplied. This is the reason why it’s impossible to recover the color after this operation as there is no way of knowing if blue channel had a value of 200 or 255 before (or any value above 127). ![]() ![]() Here is how they will appear in different modes: Let’s also say color modes are LA and La and they both have 50% transparency and are fully white color (value of 255).
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