Ability to select image layer scaling method

[ono]

Currently when I scale down image layer it seems to use nearest neighbor to display the result, also the look differs relatively if Pixel Model is on or off.

Here is the experiment, with the following 256x256 image:

ScaleDownSource.png

Scaling it down to 64x64 I get following result with Pixel Mode on:

ScaleDownPixelModeOn.png

However when I fix the layer I get:

ScaleDownFixedLayer.png

Any reason of such behavior Is there any way to control the method layer gets scaled (both for preview and Fix Layer) ?

This is pretty annoying because unless I ensure all bitmap layers are Fixed, I get different output that what I see.

[Herbert123]

Yes, I totally agree - I have also asked about this: when we fix a layer currently Lanczos is applied, but that is the worst one for that type of imagery. When we fix a layer, we should get an option to choose the sampling method.

Currently I workaround this by only using the layer resize option in the menu. It means I scale the layer down visually, take note of the dimensions, then undo the scaling, and use the menu option which does include a choice of downsample algorithms (at least, in the newer beta versions).

For scaling down and up layers there should be some sort of option to control the sampling algorithm. And then there's the lack of an overall pixel alignment option for all layers...

[Martin Huber]

Any reason of such behavior

High-quality scaling is too slow for dynamic on-screen rendering.

Is there any way to control the method layer gets scaled (both for preview and Fix Layer) ?

Currently not.

This is pretty annoying because unless I ensure all bitmap layers are Fixed, I get different output that what I see.

I don't recommend fixing the image layers, because you will lose information. If you want to resize the image layer later, you may need that information.

Martin

[ono]

Any reason of such behavior

High-quality scaling is too slow for dynamic on-screen rendering.

Understood.

Is there any way to control the method layer gets scaled (both for preview and Fix Layer) ?

Currently not.

Okay, the problem here however is that Lanczos sampling sometimes gives worse results (more blur) than Bilinear when downsampling. Would be nice if one can control the sampling of the particular layer, currently I can only switch Nearest Neighbor (no antialiasing)/ Lanczos. Or at least to have some global setting:

• Preview sampling method: [ Bilinear V] (by default, but why not let someone choose something else if one has decent CPU)
• Output sampling method: [ Lanczos V] (by default)

This is pretty annoying because unless I ensure all bitmap layers are Fixed, I get different output that what I see.

I don't recommend fixing the image layers, because you will lose information. If you want to resize the image layer later, you may need that information.

That's why inability to control way the layers are downsampled makes it even worse.