Opened by mary at 2010-06-11 08:32
Hallo,
I have two grayscale pictures (same size (1024,768), grayscale from 0 to 255). I want to take the difference of this two pictures. (difference of the grayscale values for each pixel)
I tried something but there's an error:
gd-png: fatal libpng error: Invalid number of colors in palette
gd-png error: setjmp returns error condition
here the code:
may be you can help me
thanks
Last edited: 2010-06-11 08:45:59 +0200 (CEST)
I have two grayscale pictures (same size (1024,768), grayscale from 0 to 255). I want to take the difference of this two pictures. (difference of the grayscale values for each pixel)
I tried something but there's an error:
gd-png: fatal libpng error: Invalid number of colors in palette
gd-png error: setjmp returns error condition
here the code:
Code: (dl
)
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use GD;
# create a new image
$im = new GD::Image(1024,768);
$bildin= "img/CH_IR039/05100100.039";
$bildout= "img/CH_IR039/05100100.png";
$bildin2= "img/CH_IR108/05100100.108";
$bildout2= "img/CH_IR108/05100100.png";
$befehl = "convert ".$bildin." ".$bildout;
system($befehl);
$befehl2 = "convert ".$bildin2." ".$bildout2;
system($befehl2);
$myImage = GD::Image->newFromPng($bildout);
$myImage2 = GD::Image->newFromPng($bildout2);
$k=0;
for ($x=0 ; $x<=1023; $x++) {
for ($y=0 ; $y<=767; $y++)
{
$index = $myImage->getPixel($x,$y);
$index2 = $myImage2->getPixel($x,$y);
($Image1,$dummy1,$dummy1) = $myImage->rgb($index); #Achtung evt. $red[]
($Image2,$dummy1,$dummy1) = $myImage2->rgb($index2);
$color = $Image1-$Image2;
$im->setPixel($x,$y,$color);
$k++;
}
}
open(PICTURE, ">picture.png") or die("Cannot open file for writing");
binmode PICTURE;
print PICTURE $im->png;
close PICTURE;
may be you can help me
thanks
Last edited: 2010-06-11 08:45:59 +0200 (CEST)