Image formats
JPEG compression
JPEG compression is suitable for delivering photographic images with minimal quality loss and high compression rate. You can either choose the compression factor yourself or use Optipress - our Machine Learning-based algorithm, which will find the most optimal compression to reduce JPEG file size while minimising the perceived quality loss.
| filter | ||
|---|---|---|
| force format | force_format=jpeg | forces using the JPEG image compression. |
| quality | q=X X = 0..100 | the smaller the value of q, the more your image will be compressed. Careful—the quality of the image will decrease as well. |
| optipress | optipress=X X = 1..3 | chooses the best compression approach maintaining visual quality via the Optipress algorithm. |
Compressed with JPEG
/v7/sample.li/woman_dress.jpg?force_format=jpeg&q=90
| filter value | file size |
|---|---|
| q=90 | 282 KB |
| q=80 | 141 KB |
| q=75 | 125 KB |
The JPEG compression does not support transparency. For alpha channel support, use WebP or PNG instead.
PNG format
This format is a good choice for non-photographic images - flowcharts, graphs, screenshots, logos, etc. PNG also supports transparency.
| filter | syntax | |
|---|---|---|
| force format | force_format=png | forces using the PNG image format. |
PNG example
/v7/sample.li/cloudimage_logo_landing_tsp.png?w=800&force_format=png
WebP
WebP is an image format maintained by Google and supported in certain browsers (mainly Chrome, Opera and on Chrome Android) which provides more aggressive compression techniques as JPG without noticeable quality degradation.
By default, automatic WebP delivery is switched off. When activated from the settings console, all images are delivered as WebP. If the client's browser does not support this format, JPEG or PNG (if image has alpha channel) is used instead.
You can force delivering your image in WebP by using following filters:
| filter | syntax | decription |
|---|---|---|
| force format | force_format=webp | forces using the WebP image format. |
| quality | q=X X = 0..100 | the smaller the value of q, the more your image will be compressed. Careful—the quality of the image will decrease as well. |
Please note that if you force WebP (using force_format=webp) compression and the client/browser does not support WebP, the image will not be displayed. To avoid this, you can provide a fallback format if WebP is not supported: force_format=webp,jpeg. This way, the image will be served as JPEG when WebP is not supported.
Original image
Here, the original image is JPEG and by default, the resized version is delivered as WebP, if possible.
Force using original format
/v7/sample.li/boat.jpg?w=400&force_format=original
Now, the processed image is forced to keep its original format.