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If you use
int imagecreatefromgif (string filename);
To take a picture of a GIF format, when the background or basic canvas sample is used, draw a graphic on it, please note:
If there is no pigment in this file, you will not be able to use it.
Solution, you can use
int imagecreate (int x_size, int y_size);
Create a fully-empty graphic. Draw a graphic on it. Use black as a transparent color.
This new graphic will be the same size as the original graphic, absolute position is the same, put it above the original graphic, you can.
Imagecolortransparent ($im, $black);
Use black as a transparent color
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