CODEWITHSUNDEEP
javaandroidbitmap
Adem
Adem

Reputation: 9429

How to turn all colorful pixel to gray in drawable or bitmap

I want to draw a bitmap, but with only gray pixel (for example 0x555555 color).

So I should change all the colorful pixel's color to gray.

How to do this or how to draw an image with only grayed pixels?

Upvotes: 0

Views: 395

Answers (2)

Boris Strandjev
Boris Strandjev

Reputation: 46943

What you are looking for is called "converting image to grayscale in English". Making a simple search I found the following thread (luckily it targets exactly Android. Hopefully it will help you.

Upvotes: 1

Bigflow
Bigflow

Reputation: 3666

You can read every pixel, convert it to RGB color system. Then if you want grey, then Red, Green and Blue must have equal value.

I don't know exactly what is best, when you get the good "gray" color. But maybe if you do this math: (Red + Green + Blue) / 3 = x Color R = x, G = x, B = x; Then they all got the same color, but I don't know if yo get a correct gray scale with this.

If you need more information, just say it, I got some code how to read pixels from a bitmap and convert them into RGB color system.

Upvotes: 0

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