CODEWITHSUNDEEP
imageimage-processingcolorsimage-editing
Alede
Alede

Reputation: 25

Easy way to convert color range to another?

I would like to convert the purple color in this image:

enter image description here to blue such as:

enter image description here

Is there an easy way to accomplish this? If not, is there an easy way to replicate the same effect?

Thanks

Upvotes: 2

Views: 177

Answers (1)

Dr. belisarius
Dr. belisarius

Reputation: 61026

You could separate the image in R,G and B channels, and replace the red channel by zeroes, leaving only the G and B channels.

Example in Mathematica:

i = Import["http://tinyurl.com/3wqklof"];
ColorCombine@{ImageSubtract[#[[1]], #[[1]]], #[[2]], #[[3]]} &@ ColorSeparate@i

enter image description here

Edit

Or, If you need an "exact" blue image, separate in the "HSB" color space, replacing all non zero values of the H matrix by 2/3 (blue), leaving the S and B components untouched.

Example: 

ColorCombine[{Image[2/3 ImageData@ImageAdd[#[[1]], #[[1]]]], #[[2]], #[[3]]} &@
              ColorSeparate[i, "HSB"], "HSB"]

enter image description here

Upvotes: 2

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