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Index › Programming Questions & Help › Programs › help with PImage <-- noob Q
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help with PImage <-- noob Q (Read 1094 times)
Digi-D
help with PImage <-- noob Q
Oct 6th, 2006, 6:12am  
Hi all,

I just began learning Processing. For starters wanted to write out an image file.

Wrote the following code:

 //Test image creation and output


PImage testImage;
int i;

testImage=createImage(100, 100, RGB);
for(i=0; i=testImage.pixels.length; i++)
{
 img.pixels[i] = color(0,0,0);
}

testImage.save("testMe.jpg");

Here are the errors that got thrown at me:

/tmp/build54599.tmp/Temporary_1449_3681.java:7:11:7:36: Semantic Error: No applicable overload for a method with signature "createImage(int, int, int)" was found in type "java.awt.Component". Perhaps you wanted the overloaded version "java.awt.Image createImage(int $1, int $2);" instead?

/tmp/build54599.tmp/Temporary_1449_3681.java:8:10:8:34: Semantic Error: The type of this expression, "int", is not "boolean".

/tmp/build54599.tmp/Temporary_1449_3681.java:10:3:10:5: Semantic Error: No accessible field named "img" was found in type "Temporary_1449_3681".

/tmp/build54599.tmp/Temporary_1449_3681.java:13:1:14:9: Semantic Error: These statements are unreachable.


I am not quite sure why this would be a problem unless RGB is not defined. Any ideas?

              thank you,
                                      dima
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kirton
Re: help with PImage <-- noob Q
Reply #1 - Oct 7th, 2006, 7:42pm  
You need to change this:

Code:
img.pixels[i] = color(0,0,0);

to this:
Code:
testImage.pixels[i] = color(0,0,0);

I did this and the applet exported a nice little image, all black, for me.

Cheers,
tk
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Digi-D
Re: help with PImage <-- noob Q
Reply #2 - Oct 8th, 2006, 4:32pm  
First of all thnx for the reply.

Second, sorry for posting brken code. I was cutting and pasting from a couple of places and obvously did something stupid. Got some sleep. fixed both object call and messed up for loop.

...and finally I still get:

/tmp/build49175.tmp/Temporary_1106_7912.java:7:11:7:36: Semantic Error: No applicable overload for a method with signature "createImage(int, int, int)" was found in type "java.awt.Component". Perhaps you wanted the overloaded version "java.awt.Image createImage(int $1, int $2);" instead?

I'm running Processing 115 on MacBook Pro (intel)

java version "1.4.2_09"
Java(TM) 2 Runtime Environment, Standard Edition (build 1.4.2_09-239)
Java HotSpot(TM) Client VM (build 1.4.2-66, mixed mode)

thank you,
              dima
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st33d
Re: help with PImage <-- noob Q
Reply #3 - Oct 8th, 2006, 5:14pm  
Your error is generated by version 115. Download 118.
Code:

PImage testImage;
int i;
 
testImage=createImage(100, 100, RGB);
for(i = 0; i < testImage.pixels.length; i++)  
{
  testImage.pixels[i] = color(0,0,0);  
}
 
testImage.save("testMe.jpg");
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kirton
Re: help with PImage <-- noob Q
Reply #4 - Oct 8th, 2006, 7:00pm  
ah, yeah sorry, i forgot to mention i was running 118.

cheers,
tk
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Digi-D
Re: help with PImage <-- noob Q
Reply #5 - Oct 8th, 2006, 7:47pm  
Thank very much!

Switching to 118 totally worked.

Here's klean kode just in case people are looking for it:

Code:

//Test image creation and output


PImage testImage;
int i;

testImage=createImage(100, 100, RGB);

for(i=0; i<testImage.pixels.length; i++) 
{
  testImage.pixels[i] = color(255,0,0); 
}

testImage.save("testMe.jpg");



one quesion that I still have about this little experiment:

Can I supress the window poping up behavior? Don't really needit here since I am writing out to a file.



thank you,
               dima
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