In Gimp can I change all black pixels in a picture to blue pixels?

Question

Using Gimp can I make all the black pixels with RGB(0,0,0) into blue pixels with RGB(0,0,255)?

Posting a comment since I don't have enough reputation to post an answer : I made a guide on an image here, using the "mode" setting of layers in order to replace black by another color. — sodimel, Jul 23 '21 at 10:22

score 126 · Accepted Answer · edited May 05 '18 at 16:37

126

Another way is to use the Color Exchange function.

Which is located under Colors > Map > Color Exchange and then either select the color from the preview picture using the color picker tool or just define the color to replace and the new color manually.

Here is the documentation page for that function.

edited May 05 '18 at 16:37

Zanna

70,465

answered Feb 22 '11 at 16:53

Octavian Helm

14,355

1

How do I change all colors to a single & specific color? – Dor Jan 11 '17 at 18:52
2

Note: The image should be in RGB mode Image->Mode->RGB – Opsse May 07 '19 at 13:06
Very important to switch the image mode. Also if you have just two colors, switching mode to indexed after the replacement also saves you a lot of bytes. – Chibueze Opata Mar 09 '20 at 16:58

score 31 · Answer 2 · answered Feb 22 '11 at 16:55

31

Replacing a colour can be done like this:

Activate the "Select by colour" tool:
- In the tool options, choose a threshold (0 if you want it to be precisely rgb(0,0,0))
Click on a black pixel
Select your new colour and drag it onto the image

answered Feb 22 '11 at 16:55

Stefano Palazzo

86,783

In Gimp can I change all black pixels in a picture to blue pixels?

2 Answers2