See how the characters and background blur together? The nice contrast between the background buildings and the character on the right is no longer present. Here’s the same image, but with saturation forced to 50 percent (Photoshop style). Here’s another colorization - this time to orange. If you force saturation values to an arbitrary number - like Photoshop or GIMP - the colorized image looks either drab or blown-out. I really like the effect created when you keep the saturation values from the original image. Most require you to specify hue and saturation values, with luminance being optional. In the demonstration above, each pixel in the second picture has the exact same saturation and luminance as the top picture, but all hue values have been replaced with blue.ĭifferent programs implement colorization differently. Here’s the original image (a poster for Enslaved: Odyssey to the West).Ĭolorization works by retaining certain data about each pixel’s color (luminance and possibly saturation) while ignoring other data about color (hue). This is the type of colorization filter provided by software like Photoshop and GIMP, and it’s also the effect my source code provides. Colorization of an entire movie is expensive and time-consuming, and a lot of human intervention is required to make things look right.Īnother form of “colorization” is taking any image - including full-color ones - and colorizing the image for dramatic or artistic effect. One example of this is the old Three Stooges movies which were originally shot in black-and-white, but re-released several years ago in color. Most commonly, to colorize an image is to take an image without color (like a black and white photograph) and artificially apply color to it. “Colorization” in image processing can refer to one of several things.
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