Convert Jpeg to Avif

[Sammy190]

Hello,

I am trying to convert a Jpeg image to Avif format using the latest version of Magick.NET

I tried to apply the following code :

magickImage.Quality = 80;
magickImage.Settings.SetDefine(MagickFormat.Avif, "method", "4");
magickImage.Format = MagickFormat.Avif;

Which converts the image to Avif format, but with a terrible quality. And changing the Quality parameter or the method does not seem to have any effect (the size of the image file does not change).

I got the commands from this page : https://imagemagick.org/script/webp.php
I know these commands are used for the Webp format and can be incompatible in my context, but I could not find anything about Avif in the documentation

My question is :
Are there specific commands in Magick.NET to adjust the compression quality and speed on the Avif format, the same way we can do with the Webp format ?

[dlemstra]

You cannot use the WebP options and expect them to work. Setting the Quality property should change the quality of the output image. Can you share your input image that can be used to reproduce this?

[Sammy190]

Thank you for your quick answer.

So the quality parameter is generic to all the image formats.
Here are the image I used + the outputs for a quality = 100 and quality = 20
images.zip (I put a zip because I could not upload *.avif files)

The resulting image is too blurry, especially around the red circle parts. I have far better results when using Webp. Is this normal ?
Are not there other parameters like the quality command to fine tune the Avif output

[dlemstra]

I am getting a different output image when I set the quality to 100 so I am not sure if we are doing the same thing. But it does look like avif images are not the best format for these type of images. There are no other options available right now for heic that have impact on the quality.

[Sammy190]

Could I ask what do you mean by "avif are not the best format for these types of images" ? Do you mean Avif is not suited for xray images ?

I had another question if I may ask, I saw that the library had a method :
ImageOptimizer().LosslessCompress(Stream)
Which can be used for lossless compression but only for the Jpg, Png, Gif and Icon formats.

For the Webp format we have the command : magickImage.Settings.SetDefine(MagickFormat.Webp, "lossless", "true") that does the same I guess if we follow the description.

Do we have a similar command that I missed to apply a lossless compression on Avif ? Or is quality = 100 applying implicitly a lossless compression ?

[Sammy190]

Hello,
Sorry about the insistance but it's been two weeks and I didn't have an answer.
Can you just give me more details about the first question please : "avif are not the best format for these types of images" ? What did you mean by that ?
Thank you