Quality

quality

Used for specifying the quality of the image output. Can be specified not only be value, but algorithm (or program) as well.

When providing different algorithms, you need to calculate the CU costs as well.

Aliases

• q

Parameters

• 0-100: lowest - highest quality, or lossless media formats - provides the depth of the algorithm (fast - slower)
• jpegoptim: Jpegoptim JPEG optimization procedure
  • jpegoptim: + 0-100: jpeg optimization quality (0: weakest, 100 best quality)
• optipng: OptiPNG PNG optimization procedure

Limitations

• the compressing algorithm / program specifies the output image format, so a JPEG optimization yields JPEG output as well, regardless whether you wanted a PNG or not

Dependencies

• This transformation does not have any dependencies.

Examples

4.9KiB

w:200

use shardimage\shardimagephp\factories\Transformation;
$transformations = (new Transformation())->width(200);

4.0KiB

w:200_q:30

use shardimage\shardimagephp\factories\Transformation;
$transformations = (new Transformation())->width(200)->quality(30);

15.2KiB

w:400

use shardimage\shardimagephp\factories\Transformation;
$transformations = (new Transformation())->width(400);

9.8KiB

w:400_q:40

use shardimage\shardimagephp\factories\Transformation;
$transformations = (new Transformation())->width(400)->quality(40);

7.8KiB

w:400_q:jpegoptim:40

use shardimage\shardimagephp\factories\Transformation;
$transformations = (new Transformation())->width(400)->jpegoptim(40);