Flattening vs One layer

[ewk@adobeforums.com]

What is the difference between a file that has only one layer and a file that is flattened and thus also has only one layer? Anything?

[Ronald_Lanham@adobeforums.com]

Flattened = smaller file but no transparency
One layer = transparency option available

[Scott_Weichert@adobeforums.com]

Flattened = locked single layer
One layer = movable and scalable within the document size due to the transparency Ronald mentioned.

Just experiment, you'll find allsorts of differences.

[Buko@adobeforums.com]

you can't use the one layer file in Quark

but you can use it in InDesign.

[Ronald_Lanham@adobeforums.com]

One of my printers said he received an InDesign file with a linked PSD that had almost 100 layers in it. He said it printed fine. Brand X is definitely on its way out.

[JasonSmith@adobeforums.com]

All that InDesign, sees is the flattened composite of the PSD.

It has no idea how many layers are in a particular PSD file.