You lose a lot of information when converting a 16 Bits image to 8 Bits, and sometimes this can cause artifacts in the converted image.

When you have to convert a 16 Bits to 8 Bits image, you can add the dithering effect in the post-processing panel, this will avoid these artifacts in this type of conversion.

The add-on uses the power of blender's natives render engines to generate new images with the user's selected settings (New Size, New Format)

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These are some features that aren't fully supported. it's working! but sometimes it will not work 100% as expected

Blender does not support advanced scaling filters like external image converters.

This means that when you downsize an image with FormatSwap, the image may get more pixelated than using an external image resizer. 

If you need to use a resized texture (especially textures resized to 1K resolution or bellow) in a close-up render, it is still recommended that you use an external image converter/resizer for best quality or keep the original texture size.

Nothing Happens! the conversion process will be simply stopped. the replacing texture process only starts when textures were converted

Blender UI Freezes when an operator takes more than 5 seconds to run. in the FormatSwap case, this process can take minutes or more (talking about a scene with more than 100 textures).

This time will depend on your hardware, but you can check all the progress in the blender console.

FormatSwap Reduces the Render loading time, the process that happens before the rendering process truly starts. If you have a scene with hundreds of 4K textures, all these textures will be loaded before the render starts.

By converting or reducing the texture size, this loading time will be significantly slower, resulting in a faster render time.

The addon was 100% tested in Windows OS only, some features may not work properly in other OS.

It happens when you try to convert a normal map/displacement map to another format, like JPG. in this type of conversion, the image loses a lot of o information and can cause a lot of artifacts in the material.

Try to use the Critical Map Detector tool, in the addon tab before starting the conversion. in this panel, you will be able to ignore the displacement/normal map, keep the format or keep the size. and now these maps should work correctly in your scene.