| Adobe Photoshop CS4 | 
PDF (adobe.com)
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| Adobe Photoshop CS4 |
PDF (adobe.com)
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Merge and stamp layersWhen you have finalized the content of layers, you can merge them to reduce the size of your image files. When you merge layers, the data on the top layers replaces any data it overlaps on the lower layers. The intersection of all transparent areas in the merged layers remains transparent. Note: You cannot use an adjustment
layer or fill layer as the target layer for a merge.
In addition to merging layers, you can stamp them. Stamping allows you to merge the contents of more than one layer into a target layer while leaving the other layers intact. Note: When
you save a merged document, you cannot revert back to the unmerged state;
the layers are permanently merged.
Merge layers in a clipping mask
For more information on clipping masks, see Mask layers with clipping masks. Merge all visible layers and groups in an image Choose Merge Visible from the Layers panel
or the Layers panel menu. All layers showing an eye icon  are
merged. Note: A visible layer must be selected to enable the Merge
Visible command.
Stamp multiple layers or linked layersWhen you stamp multiple selected layers or linked layers, Photoshop creates a new layer containing the merged content.
Flatten all layersFlattening reduces file size by merging all visible layers into the background and discarding hidden layers. Any transparent areas that remain are filled with white. When you save a flattened image, you cannot revert back to the unflattened state; the layers are permanently merged. Note: Converting
an image between some color modes flattens the file. Save a copy of
your file with all layers intact if you want to edit the original
image after the conversion.
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