Vips writeToBuffer not apply the image quality

Question

I am trying to use libvips writeToBuffer method with quality, but it's not apply the quality to the image is there any other method for set the quality. I have below case if file exists then it call the writeToFile otherwise writeToBuffer. IS there any solution for achieve below case?

$image = Vips\Image::newFromFile($sourceimgfile);
$result = $image->writeToBuffer('.jpg', ['Q' => 50]);
file_put_contents($destinationimgfile, $result);

Actual output:

enter image description here

If I set image quality 50, then it should give me low resolution image but still it generate same image like input image. It didn't applied the quality on image.

It should work. You need to give more information: what file sizes do you see, what do you expect, what libvips version are you using, what platform are you using, make a complete, runnable program that shows the problem, etc. etc. — jcupitt, Dec 25 '20 at 10:24
It's Working actually it i tried to apply low resolution, i compare both images it works fine. Thank you — Test Human, Dec 25 '20 at 10:59

score 0 · Answer 1 · answered Dec 25 '20 at 13:38

It should work. You can test this at the command-line like this:

$ vips jpegsave_buffer astronauts.png --Q 20
VIPS_TYPE_BLOB, data = 0x7f5388000b60, length = 55617
$ vips jpegsave_buffer astronauts.png --Q 90
VIPS_TYPE_BLOB, data = 0x7fefbc6f9010, length = 263341

So at Q 20, it's only 55kb, but Q 90 is 260kb.

Vips writeToBuffer not apply the image quality

1 Answers1