Lossless color space transformation from RGB

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Hello, I'm working on image watermarking and I have to change the color space of host image from RGB to a new color space that is lossless, reversible and novel. I've already tried Y.Cb.Cr and Y.Co.Cg color spaces, and now I need a new color space. Do you have any suggestion?

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Image Analyst
Image Analyst 2018-7-27
If you stay with double data type, it will be about as lossless as you can get. I have no idea what your definition of novel is. I guess if there is a color space, and people have heard about it, like LAB, HSV, HSI, HSL, HSB, YCbCr, LUV, etc., then it's not novel. How do you define it?
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mohammad moosazadeh
Thank you for your answer. I know you are very hardworking in this website. Thank you so much. I need to a new color space. for example, I've used YCoCg-R color space in my old project that it was new in image watermarking field.

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