Using php vips to convert indexed/alpha transparent gif/png to jpg with non black background

[richardsyeo]

I have tried without success to use php vips to convert indexed/alpha transparent gif/png to jpg and set background to be color other than black which is default when using below code.

$image = Vips\Image::newFromFile('vips_test_source/quad_indexed.png');

how do i remove transparency and set background to be white not black?

$image->writeToFile('vips_test_output/quad_indexed.jpg');

Using Ubuntu 22.04 which appears to come with 8.12.1 of vips.

Any solutions much appreciated.

[jcupitt]

Hi @richardsyeo, you just set background, eg.:

$image->writeToFile('vips_test_output/quad_indexed.jpg', [
    'background' => 255
]); 

[richardsyeo]

thanks for super quick response. wow thats easy. i was looking for too complicated a solution.