How to compare pixel colour with pixel by pixel using CGPoint in UIImage

Asked Jan 25 '17 at 05:39

Active Jan 31 '17 at 05:09

Viewed 73 times

In my project I need to remove selected colour like wand tool.For this i was used flood fill algorithm(Flood fill).but it was not working properly for colour comparison(pixel by pixel).can any one suggest the solution.

In below images i need to remove background colour only(expected).

output Result.

can any one please help me with code Or example.

edited Jan 31 '17 at 05:09

asked Jan 25 '17 at 05:39

Lakshmi Keerthana Siddu

The problem is that the "white" background is not actually pure white. Have you tried adjusting the `tolerance` parameter to account for this? – Rob Jan 25 '17 at 05:50
even I am getting a same issue i tried to adjust tolerance but complete image is getting erased. – Uttam Jan 25 '17 at 06:03
Yes, I did that, I am not getting exact output which i excepted.Means expected colour pixels were still appearing.unexpected pixels were removed. – Lakshmi Keerthana Siddu Jan 25 '17 at 06:04
Can I use GPUImage for this. – Lakshmi Keerthana Siddu Jan 25 '17 at 10:11

How to compare pixel colour with pixel by pixel using CGPoint in UIImage

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