You can make minor adjustments to the position of selected pixels, using the arrow keys to nudge the oval in increments of either 1 pixel or 10 pixels.
When your selection tool is active in the toolbox, the arrow keys nudge the selection border, but not the contents. When the move tool is active, the arrow keys move the selection border and its contents.
Before you begin, make sure that the black oval shape is still selected in the image window.
1 In the toolbox, select the move tool (-..) and press the Up Arrow key (El) on your keyboard a few times to move the oval upward.
Notice that each time you press the arrow key, the oval moves in 1-pixel increments. Experiment by pressing the other arrow keys to see how they affect the selection.
2 Hold down Shift, and press an arrow key.
Notice that the selection now moves in 10-pixel increments.
Sometimes the border around a selected area can distract you as you make adjustments. You can hide the edges of a selection temporarily without actually deselecting and then display the selection border once you've completed the adjustments.
3 Choose View > Show > Selection Edges or View > Extras. The selection border around the oval disappears.
4 Use the arrow keys to nudge the oval until it is positioned where you want it. Then choose View > Show > Selection Edges or View > Extras.
Copying selections or layers
You can use the move tool to copy selections as you drag them within or between images, or you can copy and move selections using the Copy, Copy Merged, Cut, and Paste commands. Dragging with the move tool saves memory because the Clipboard is not used as it is with the Copy, Copy Merged, Cut, and Paste commands.
Photoshop and ImageReady contain several copy and paste commands:
• The Copy command copies the selected area on the active layer.
• The Copy Merged command makes a merged copy of all the visible layers in the selected area.
• The Paste command pastes a cut or copied selection into another part of the image or into another image as a new layer.
• (Photoshop) The Paste Into command pastes a cut or copied selection inside another selection in the same image or different image. The source selection is pasted onto a new layer, and the destination selection border is converted into a layer mask.
Keep in mind that when a selection or layer is pasted between images with different resolutions, the pasted data retains its pixel dimensions. This can make the pasted portion appear out of proportion to the new image. Use the Image Size command to make the source and destination images the same resolution before copying and pasting.
-From Adobe Photoshop 7.0 online Help
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