Gd Library Help

[cabeludo007]

Hi!
I was trying to make a 'api' for the Habbo Camera, but that need experience in GD Library and i don't have so much.

So, i need help about this part:
this image came with Black Background

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i need to know how to transform the black background in transparent each dark level in each pixel
for get this effect

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if anyone know, i would be grateful in know about that ^^

 

[Joopie]

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As of the GD library in PHP does not have such functions, you have to implement it by yourself.

 

[cabeludo007]

I've already readed this and i didn't understand that i have to get the colors of sprite and add to backgeound colors xD

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Thanks for help Joopie <3

 

[s-p-n]

Can't you just merge two PNG images to get that effect? Like, draw habbo picture first, then draw the effect from a semi-transparent PNG on top of it..? You can do this in JavaScript Canvas pretty easily and submit the bytes for the image using a form and some AJAX... Or PHP if you really wanted to.

If you really need to find all of the black pixels with 100% alpha in an image, and convert those pixels to 0 alpha before overlaying the result on top of another image, you need to loop through all of the pixels in the image, do a conditional statement to see if the pixel is black, and if so, set the alpha to be completely transparent. In JS + Canvas, you get all of the pixels using a function. In PHP, you loop the width and height, and do some code inside the two loops...

$width = 500;
$height = 500;
for ($x = 0; $x += 1; $x < $width) {
  for ($y = 0; $y += 1; $y < $height) {
    // figure out if the pixel is the one u want to change..
    // if so, change it..
  }
}

In JS+canvas you do basically the same thing, but you have the option of doing it in a more functional style if you want to.

Then draw the generated image on top of the other one.

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