SikuliX

Comparing RGB Colours

Asked by Dave Marsden

I'm trying to compare some pixels to a set colour to find the extents of some selected text. I'm using the code.

    PixColour = MyRobot.getPixelColor(c,y)
    pColour = PixColour.getRGB()
    print PixColour, hex(pColour), hex(colour)
    if pColour == colour:
        print c

Which is printing out

java.awt.Color[r=49,g=106,b=197] -0xce953b 0x316ac5

By my reckoning the RGB values should give a hex value of 0x316ac5 however they aren't they are give -0xce953b and hence my detection of the colour is failing.

Can anyone explain to me where I'm going wrong

Thanks

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RaiMan (raimund-hocke) said : 		#1

If you want to compare a pixel color this way using the AWT Robot, you should stay on the Color level:

import java.awt.Robot as JR
import java.awt.Color as JC
rob = JR()
col = rob.getPixelColor(some.x, some.y) # some is some Location()
comp = JC(228, 55, 50)
print redc == comp

But be aware, that this feature is very slow and only acceptable to check a few pixels.

In your case it might be easier to create small targets (e.g. 4x4 Pixels as the corner of the selected area) and search it with something like:

region_left_corner.nearby(3).right(300)

where the nearby(3) creates some extra padding area around.

Can you help with this problem?

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