How to convert .png file to .bmp?

问题

I need to convert a .png file to .bmp; I'm using the outcome in printer_draw_bmp() to print out a barcode.

GD can generate WBMP, but as far as I can tell that's not the same as .bmp. How can I do this conversion? Or is there another way to print a .png directly?

回答1:

There is a opensource project on Github that allows reading and saving of BMP files (and other file formats) in PHP.

The project is called PHP Image Magician.

回答2:

AFAIK, GD doesn't support bmp format. But you can use ImageMagick to save file in bmp format:

$im = new Imagick('image.png');
$im->writeImage('image.bmp');

Or if you want to output image to http response:

$im = new Imagick('image.png');
$im->setImageFormat('bmp');
echo $im;

来源：https://stackoverflow.com/questions/17827498/how-to-convert-png-file-to-bmp