We at Business company in mind that the human eye can detect a wider tonal range than can be printed. If your scanner allows, set the black and white points before scanning a file to produce the best tonal range and capture the widest dynamic range. Then use Photoshop's color adjustment tools to set.

With layers, you can work on one element without disturbing others. To rearrange elements, simply shift the order in the Layers palette. You can lock layers to prevent accidental changes, hide them to get a clear view of the element you're working on, and link layers to move them as a group. The Layers palette also makes it easy to apply instant, editable effects including blending modes, adjustment layers, and layer effects. The tool editable effects including blending modes, adjustment layers, and layer effects. to thes peoples for the tool you're using...

You can lock layers to prevent accidental changes, hide them to get a clear view of the element you're working on, and link layers to move them as a group. The Layers palette also makes it easy to apply instant, editable effects including blending modes.