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Index › Programming Questions & Help › Programs › threshold errors
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threshold errors (Read 340 times)
seanyseanyseany
threshold errors
Jan 5th, 2009, 4:22pm  
Im trying to run this code from Processing by Ian Greenberg

size (800,200);
PImage img = loadImage("ketty.jpg");
float thresholdLevel = 1.0;
for (int i=0; i<4; i++){
 image(img, 200*i, 0, 200, 200);
 filter (THRESHOLD, thresholdLevel);
 thresholdLevel-=.25;
}

getting a nullpointerException error, also tried using the the example code from processing site

PImage b;
b = loadImage("ketty.jpg");
image(b, 0, 0);
filter(THRESHOLD);

coming up with same error, im using 0156 beta on macbook.

cheers
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PhiLho 
Re: threshold errors
Reply #1 - Jan 5th, 2009, 5:03pm  
FYI I tested with Processing (Expert) 0154 and 1.0.1 on Windows XP Pro SP3, using Java 1.6.0_11 and I got the desired result, no NPE.
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NoahBuddy
Re: threshold errors
Reply #2 - Jan 5th, 2009, 5:57pm  
Could you copy the console output showing the null pointer exception, or do you know which line is highlighted when it faults?
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seanyseanyseany
Re: threshold errors
Reply #3 - Jan 5th, 2009, 6:02pm  
Hi I found the problem, it was not reading the image although it was working in other sketches. I just added file again and its running fine. thanks for ur help though
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