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Check the Polygon Lasso Options
palette on the right. Options change according to the tool you have
selected. Feather by 1 or 2 pixels to soften the edges of the
selection and tick the Anti-aliased box to smooth jagged edges
further.
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You can now select the Mona Lisa by carefully clicking around her
outline. Click on the image wherever you want to anchor the line and change
direction.
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To delete an anchor point press Delete on the keyboard. If you
make a mistake go to Select > None and start again.
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When the marquee encloses the selection and has connected with the start
point, double click to close the border.
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Go to Edit > Copy
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Click on the destination image [B] and go to Edit > Paste. The
selection will be pasted as a new layer. Click off the selection tool you used.
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You can resize the selection (Mona Lisa) by going to Edit >
Transform > Scale. Drag the handles to re-size and press Enter or
double click to apply the transformation.
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Edit > Transform
> Rotate allows you to tilt the selection.
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Use the Move tool to position the selection
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To
place the diving board over the figure go to the Layers palette and click
on the Background layer to activate it.

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This time, as there is a strong tonal contrast between the board and the water
you can use the Magic Wand to make a selection. The Magic wand selects
pixels by similar colour. Click on
the Magic Wand and check the tool Options. Experiment with
different tolerances [the range is 0 – 255]. I used a Tolerance of 20.

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Copy and paste the selection
as before. Position it on top of the original diving board.

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Use the Rubber Stamp tool to clone part of the splash to cover the
figure: click on the Background layer again and ALT- CLICK to
select a source for the stamp. Select another layer to paint the splash on or
make a new layer for it: Layer > New > Layer. Call it Splash.
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When you have finished manipulating the image merge all the layers into
one to reduce file size: Layer > Flatten Image. This is irreversible,
so only do it when you are satisfied that you have no further changes to make to
those layers.