Grainy Previews

[gcha]

A couple of Questions, 1. Often to almost always, when a Preview Window opens to show a view of a particular action, it appears very grainy. I set my previews to Medium Size. It becomes difficult to evaluate Sharpen and other transformations as a result. 2. Sometimes only after three or transformation actions, I get a MEMORY FULL splash screen, and cannot continue with my edit... I then close out of PWP, return and all is well again and can continue with the edits. I am careful to only have the image file that I am working to be the active one, all other image files are closed.
I am using latest upgrade to PWP Pro 3.5
Thanks,
Gary

[HanSch]

The previews are low resolution images (for speed). Changing to Large Size doesn't change this. To evaluate (many) transformations you will need to set your preview window to 1:1 and scroll to a suitable region.

[jsachs]

The apparent graininess is due to the fact that image windows are anti-aliased and preview windows are not. To anti-alias preview windows would slow down previews considerably, effectively defeating the purpose of preview. If you preview at a zoom factor of 1:1 or greater anti-aliasing is not an issue and this is what you need to do to preview sharpening, etc.

If you are running out of memory, first make sure you have a swap file of 4GB which is the maximum useful size under 32-bit Windows. If you are still getting out of memory errors, you are probably working with very large images. An upcoming version of PWP will support 64-bit Windows and remove many of the memory limits in the 32-bit version.