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Pixel layer offers "Rasterize" command — why?

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As a pixel-based layer is already a rasterized image, I think the "Rasterize" option should be greyed-out in the right-click menu of the layers panel. As it stands right now, offering to "Rasterize" an already rasterized layer is confusing.

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Yes, it seems confusing. But Rasterizing a pixel layer can change it. For example, if it has a mask, or live filters applied, they will be finalized ("baked in").

I think there are other cases where Rasterize... will also have an effect on a raster layer.


-- Walt

Windows 10 Home, version 1909 (183623.476),
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42 minutes ago, walt.farrell said:

Yes, it seems confusing. But Rasterizing a pixel layer can change it. For example, if it has a mask, or live filters applied, they will be finalized ("baked in").

I think there are other cases where Rasterize... will also have an effect on a raster layer.

Understood, however I am referring to a single pixel-based layer with nothing added to it. In such an instance, the "Rasterize" option should be greyed out as it does not appear to serve any purpose.

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32 minutes ago, photoshop1.0 said:

I am referring to a single pixel-based layer with nothing added to it.

Even then, as I said, I think there are other cases where Rasterize... will have an effect. However, I don't remember what they are. Someone else may.

If, however, Rasterize... never has an effect on a pure raster layer, then I would agree with you.


-- Walt

Windows 10 Home, version 1909 (183623.476),
   Desktop: 16GB memory, Intel Core i7-6700K @ 4.00GHz, GeForce GTX 970
   Laptop:  8GB memory, Intel Core i7-3625QM @ 2.30GHz, Intel HD Graphics 4000 or NVIDIA GeForce GT 630M
Affinity Photo 1.8.3.641 and 1.8.4.676 Beta   / Affinity Designer 1.8.3.641 and 1.8.4.676 Beta  / Affinity Publisher 1.8.3.641 and 1.8.4.663 Beta.

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1 hour ago, photoshop1.0 said:

Understood, however I am referring to a single pixel-based layer with nothing added to it. In such an instance, the "Rasterize" option should be greyed out as it does not appear to serve any purpose.

Rasterise does still serve a purpose. Transforming (scaling, rotating, skewing, moving) a Pixel object is done non-destructively, so rasterising is a valid command for a Pixel object because that will resample it to a Pixel object that has the document pixel density and is aligned with the document pixel grid.

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5 minutes ago, anon2 said:

Transforming (scaling, rotating, skewing, moving) a Pixel object is done non-destructively

When explaining the difference between ‘Image’ layers and ‘Pixel’ layers on these forums, Serif staff consistently state that an ‘Image’ layer can be transformed without losing quality. The clear implication of this is that the same does not apply to a ‘Pixel’ layer.

If transformation is non-destructive in both cases, what is the purpose of the ‘Image’ layer type? :/


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I would not consider it irrelevant on existing single pixel layers 
'Rasterise' is there for several reasons..some of which are extremely useful. Partly depends on what tools you are using and whether you want to maintain non-destructive layers or 'finalise' them using rasterise layer/rasterise to mask options. It could be a combination of:

A. Option to Rasterise embedded files
B. Rasterise Grouped vector layers and combined vector/pixel elements (one of the fantastic advantages of AD over competitor applications)
C. Rasterise sketches created with the 'vector brushes' (+grouped and combined with vector)
D. Rasterise Vector elements so you can go-digital with painting/pixel persona
E. Apply Mask to vector/pixel elements and in effect create a single pixel layer
F. Painting Vector or raster brushes onto existing images
G. Technically flatten non destructive erase...

I am sure there are more...I use all the time when painting with vector brushes or pixel brushes that need combining into single pixel images.


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1 hour ago, Alfred said:

If transformation is non-destructive in both cases, what is the purpose of the ‘Image’ layer type?

Well, for one, in Publisher (or documents created by Publisher, or layers copied from Publisher) it may be treated as a Linked image, and edited separately.  In all the applications, it will otherwise be treated as Embedded, and (before rasterization) it can be Replaced via the Context Toolbar. And in Publisher, whether Linked or Embedded, it can be tracked and operated on by the Resource Manager.

Also, for (Image) layers the Context Toolbar gives you the rescaling options, and some other options that are not present for (Pixel) layers.


-- Walt

Windows 10 Home, version 1909 (183623.476),
   Desktop: 16GB memory, Intel Core i7-6700K @ 4.00GHz, GeForce GTX 970
   Laptop:  8GB memory, Intel Core i7-3625QM @ 2.30GHz, Intel HD Graphics 4000 or NVIDIA GeForce GT 630M
Affinity Photo 1.8.3.641 and 1.8.4.676 Beta   / Affinity Designer 1.8.3.641 and 1.8.4.676 Beta  / Affinity Publisher 1.8.3.641 and 1.8.4.663 Beta.

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52 minutes ago, Alfred said:

When explaining the difference between ‘Image’ layers and ‘Pixel’ layers on these forums, Serif staff consistently state that an ‘Image’ layer can be transformed without losing quality. The clear implication of this is that the same does not apply to a ‘Pixel’ layer.

I prefer facts to implications :)

Both Image and Pixel objects can be transformed non-destructively.

If I'm wrong, someone will surely prove that I'm wrong. I'm sure you can work out how to test it for yourself.

 

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Rasterizing a pixel layer will also get rid of those pesky decimal places in the x/y and w/h values. For example, when you move or resize a pixel layer.

Which means you won't get that unwanted and unexpected 1px discrepancy when trying to export an image to a precise size, which can occur with pixel values that contain decimals


Due to the fact that Boris Johnson is now our Prime Minister, punctuation, spelling and grammar will never be worried about ever again.  We now have far bigger problems to be worried about.

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I always include a Rasterize a layer as the first or second step of many of my macros. Before the 'Rasterize and Trim' command was introduced, I found it effective in trimming the excess space after a non-destructive crop. This was important before calling many plugins.

John


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