imagemagick, php and database image storage

redna379

Hello to the whole community!
This is my first post, so the first thing i have to do is saying hi to everyone 😉

Now back on subject: i'm trying to convert a set of scripts i made using the GD library, used to merge different images together transforming the RBG white (255,255,255) into a transparent color.

What i'd need to do is:
1) Store images in Mysql (not in files);
2) Find a way to set RGB white as transparent;
3) Use imagemagick to work with them (GD gave me troubles because different versions behaves differently);

With GD points 1 and 2 was not difficult: pratically i did:

$source_create=imagecreate($dest_x,$dest_y);
imagecolortransparent ($source_create,imagecolorallocate ($source_create, 255, 255, 255));

$source_id = imagecreatefromstring($source_data);
imagecopyresized($source_create,$source_id,0,0,0,0,$dest_x,$dest_y,$resources_w,$resources_h);
imagecopymerge($target_id,$source_create,0,0,0,0,$dest_x,$dest_y,100);

But this doesn't work everywhere, expecially if i try to work with truecolor images with GD2 using imagecreatetruecolor.
I'd like to do this thing using magick, but i was not able to understand how to set the RGB white as transparent and, more important, how to use raw data i have in database with it.
Finally, to make all harder, i'd need to use the commandline exec function, because i cannot be sure i'll have magick php modules installed everywhere, so i'd prefer to require only imagemagick installed.

Any suggestion?

Merve

In GD, you can do it with [man]imagecolortransparent/man, which lets you make one colour the transparent colour.

redna379

I know this, as you can see from my posted php code i used that.
My problem is how to do the same thing WITHOUT gd.

Or (othr option) i have to find a way to properly have a truecolor palette with GD.
Unfortunatly, GD2 is not on the main server where this script will have to be executed. Moreover, many bundled GD2 extensions out there have troubles with the merging function.
I tryied with the imagecreatefromjpeg trick, which looks like this:

$thumb = imagecreate ($width, $height);
imageJPEG($thumb,"images/temp.jpg");
$thumb = @imagecreatefromjpeg("images/temp.jpg");

but evenif the output image is 24 bit, copy and merge produces heavy color loss anyhow, just like normal imagecreate usage.

In one word: i'd need to find a way to extend the palette with GD1 or i need to learn how to work with on-the-fly image files with magick (and i really don't know if it's possible, considering i'd like to use it in commandline mode... SIGH!).