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Nov 7th, 2009

png image croping problem

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hi all. i want to crop png image.
when i am croping the png image i got "Fatal error: imagepng() [<a href='function.imagepng'>function.imagepng</a>]: gd-png: fatal libpng error: zlib error in C:\wamp\www\taslan\admin\products.php on line 120" error message. at line no 120 shows imagepng($bgim_new,$bgth_file_name,100); this function

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rajabhaskar525

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Nov 7th, 2009

Re: png image croping problem

Click to Expand / Collapse Quote originally posted by rajabhaskar525 ...

hi all. i want to crop png image.
when i am croping the png image i got "Fatal error: imagepng() [<a href='function.imagepng'>function.imagepng</a>]: gd-png: fatal libpng error: zlib error in C:\wamp\www\taslan\admin\products.php on line 120" error message. at line no 120 shows imagepng($bgim_new,$bgth_file_name,100); this function

The 3rd optional parameter to the imagepng() is called the quality and it specifies the compression level used.
It should have the value from 0 to 9 only, you used the much higher value for it

network18

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Nov 7th, 2009

Re: png image croping problem

k. its working . but this function not supporting .bmp image files.
"

PHP Syntax (Toggle Plain Text)
 imagewbmp($bgim_new, $bgth_file_name,9);
 imagewbmp($bgim_new, $bgth_file_name,9);

" and also i put 100 like this

PHP Syntax (Toggle Plain Text)
 imagewbmp($bgim_new, $bgth_file_name,100);
 imagewbmp($bgim_new, $bgth_file_name,100);

still not working

rajabhaskar525

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Nov 7th, 2009

Re: png image croping problem

Hey.

If you are having problems with functions, look them up in the manual.

The third parameter of the imagewbmp function is not the same as the third parameter for the png function. The manual explains the difference. Even gives examples.

Atli

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Nov 9th, 2009

imagepng() works for .png format only

Click to Expand / Collapse Quote originally posted by rajabhaskar525 ...

k. its working . but this function not supporting .bmp image files.
"
PHP Syntax (Toggle Plain Text)
 imagewbmp($bgim_new, $bgth_file_name,9);
imagewbmp($bgim_new, $bgth_file_name,9);
" and also i put 100 like this
PHP Syntax (Toggle Plain Text)
 imagewbmp($bgim_new, $bgth_file_name,100);
imagewbmp($bgim_new, $bgth_file_name,100);
still not working

Its very natural if imagepng() doesn't suppport .bmp images.
and the imagewbmp() is not having the same parameters as like imagepng().
The 1st parameter to imagewbmp() is the image resource , 2nd is the file path and the 3rd is the forground color to be specified as the int value.The default value to it that of the black color.

network18

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Nov 19th, 2009

Re: png image croping problem

Click to Expand / Collapse Quote originally posted by network18 ...

The 3rd optional parameter to the imagepng() is called the quality and it specifies the compression level used.
It should have the value from 0 to 9 only, you used the much higher value for it

hello,

i am facing another problem with this. i used values between '0' to '9' then image background color is changing like black. what is alternative for this?

rajabhaskar525

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Nov 19th, 2009

Re: png image croping problem

Click to Expand / Collapse Quote originally posted by rajabhaskar525 ...

hello,

i am facing another problem with this. i used values between '0' to '9' then image background color is changing like black. what is alternative for this?

imagewbmp() sets the foreground color.
Look for setImageBackgroundColor() function of the Imagick.

network18

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Nov 19th, 2009

Re: png image croping problem

Click to Expand / Collapse Quote originally posted by network18 ...

imagewbmp() sets the foreground color.
Look for setImageBackgroundColor() function of the Imagick.

this is also one of the problem, before that i struck at imagepng(); method , i am getting croped png with black background . give me idea!!

rajabhaskar525

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Nov 19th, 2009

Re: png image croping problem

Click to Expand / Collapse Quote originally posted by network18 ...

imagewbmp() sets the foreground color.
Look for setImageBackgroundColor() function of the Imagick.

i didn't catch u. can expain clearly.

PHP Syntax (Toggle Plain Text)
$bgim_new = imagecreatetruecolor($bgth_width,$bgth_height); 
imageantialias($bgim_new,true); 
			$bgth_file_name = "productimages/140X150/$Attachments1";
			imagecopyresampled($bgim_new,$bgim_old,0,0,0,0,$bgth_width,$bgth_height, $bgimage_attribs[0], $bgimage_attribs[1]);
if(($filetype1=='image/png') || ($filetype1=='image/x-png') ||($filetype1=='image/PNG') || ($filetype1=='image/X-PNG'))
				{
					 imagepng($bgim_new,$bgth_file_name,9);
				} 
				else if(($filetype1 == "image/bmp") || ($filetype1 == "image/BMP"))
				{
            imagewbmp($bgim_new, $bgth_file_name,$bgim_new);
            }
$bgim_new = imagecreatetruecolor($bgth_width,$bgth_height); 
imageantialias($bgim_new,true); 
			$bgth_file_name = "productimages/140X150/$Attachments1";
			imagecopyresampled($bgim_new,$bgim_old,0,0,0,0,$bgth_width,$bgth_height, $bgimage_attribs[0], $bgimage_attribs[1]);
if(($filetype1=='image/png') || ($filetype1=='image/x-png') ||($filetype1=='image/PNG') || ($filetype1=='image/X-PNG'))
				{
					 imagepng($bgim_new,$bgth_file_name,9);
				} 
				else if(($filetype1 == "image/bmp") || ($filetype1 == "image/BMP"))
				{
            imagewbmp($bgim_new, $bgth_file_name,$bgim_new);
            }

this my code. what wrong with my code. help me.

rajabhaskar525

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Nov 19th, 2009

Re: png image croping problem

You are using the imagewbmp function incorrectly.

The third parameter of the imagewbmp function sets the foreground color of the image to a color created by the imagecolorallocate function.

Look at the third example in the manual. It shows how to correctly use the third parameter.

Last edited by Atli; Nov 19th, 2009 at 10:28 am. Reason: Typos

Atli

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