how does real-time image color filtering work

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My current knowledge is that if I want to filter an image to, let's say, a bluish tint on a ppm image, I would loop through the RGB values and increase the blue values.

However, apps like Instagram have a slider that can be used to adjust the extent of the image filter. I would assume that the program doesn't keep looping through all the RGB values to modify them. So how is it achieved so quickly?

instagram image-processing algorithm
1 Answers

This operation does not actually have much computational volume because the processors are high speed.

Of course, there is another way to do this, and that is to use the Fourier transform method. You can search about ((Filter in Frequency domain)) if you wish.

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