Posted by Jason Barnett on 01/18/05 21:09

Rob Adams wrote:
> Ok - Let me restate some of this:
>
> I am creating these images in PHP. I have a script right now that accepts
> two images. A main one, and the one that will be hidden. These can be
> either jpg, gif, or png. It then outputs a png image like this:
>
> http://imagineinc.net/images/

By main / hidden images, do you mean blending images together? Because
what I saw from visiting this link was a background scenery with a
flower etc. with red, green and blue ovals on top of it. (Firefox 1.0)

>
> I really don't know much about graphics, and struggled quite a bit just
> getting it to this point. I've tried several techniques to 'dim' the hidden
> image, or take the color out of it, but nothing has really produced what I'm
> after. I'm not even sure of the terminology, but does anyone know a way to
> 'dim' the image or to make it blend with another image? I'm just doing this

I believe the effect you are looking for is to change the alpha value of
each image. Now mind you I have never done this, but I've read posts
about this type of thing and I believe this function will help you:

http://www.php.net/manual/en/function.imagecolorallocatealpha.php

As another option: if you don't need to dynamically create these blended
colors with PHP then why not create the images manually? I.e. you can
use something like imagemagick to modify a png/gif/jpeg and then just
store the modified image on the server.

http://www.imagemagick.org/

> for fun, because I thought the concept was really cool. I don't have access
> to my code right now, but can post it later today, if any else is
> interested.
>


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