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copy() color problem

[5 Replies]
- 26-Jun-2013 08:20 AM
- Forum: Core Library Questions
Hello, I've noticed what seems to be a bug using copy on any surface or PImage. It seems that when using copy() I'll always loose one R, G and B value.

In other words, 255 will be 254 in the copy, 254 will become 253 and so on.

Here's a sketch to illustrate the behaviour:
1. void setup() {
2. size(300, 300, P2D);
3. background(0);
5. //setup the color white
6. color white = color(255,255,255);
8. //draw an ellipse with that white color
9. noStroke();
10. fill(white);
11. ellipse(150,150,50,50);
13. //sample the white color drawn
14. color white_sample_1 = get(150,150);
15. println("White sample #1 = " + red(white_sample_1)); //outputs: 255.0
17. //now copy the entire image to the same area again
18. copy(0,0,300,300,0,0,300,300);
20. //sample the white color
21. color white_sample_2 = get(150,150);
22. println("White sample #2 = " + red(white_sample_2)); //outputs: 254.0
24. //now copy the entire image to the same area again
25. copy(0,0,300,300,0,0,300,300);
27. //sample the white color
28. color white_sample_3 = get(150,150);
29. println("White sample #3 = " + red(white_sample_3)); //outputs: 253.0
30. }
This is causing me a lot of headache and problem using processing to process changes in images and sampling by colors exactly. Is this somehow logical and intended, please give me a quick run-down on why that is!

I'm using Processing 2.0

Thanks for any help on this!

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