Losses Merging

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Nahum Nir

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Aug 14, 2022, 4:58:21 PMAug 14
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Hello,
This is our use case: We have a couple of images in webp format and we need to merge them into a single image file without reducing the quality each of the images. A simple example is to concatenate two files into one.
Is there a tool for that or do we need to write one?

Thanks,
Nahum

James Zern

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Aug 15, 2022, 4:55:12 PMAug 15
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Hi,

The webpmux tool [1] can be used to manipulate webp files. It can be used to create an animation from multiple webp files.

In your example it's not clear what you mean by concatenate though. Do you want a still image with both images contained within it (e.g., one above and one below)? An animated webp can somewhat provide this, but the duration between two frames has a minimum. Otherwise to create a single frame you would need to reencode the images.

 

Thanks,
Nahum

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Nahum Nir

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Aug 17, 2022, 3:34:03 PMAug 17
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Thanks James,

We need it to be a still image. One above the other or to the right. I also made a mistake in the subject. It should be lossless.

Nahum 

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James Zern

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Aug 17, 2022, 5:05:50 PMAug 17
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On Wed, Aug 17, 2022 at 12:34 PM Nahum Nir <hello.s...@gmail.com> wrote:
Thanks James,

We need it to be a still image. One above the other or to the right. I also made a mistake in the subject. It should be lossless.

In this case you'll need to decode the images separately and encode the composite. The webp library and tools don't support this operation, but tools like ImageMagick (+append) should be able to.
 
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