after opened this image, i created a new layer. then i went to rectangular marquee tool and changed the style to the fixed size and changed the width and the height 900 x 40 pixels. moved the cursor to the upper lefthand side and clicked. the size that i changed appeared. then hold on the alt key then clicked backspace to fill the rectangular with black (the foreground color) and diselected.
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hold on the alt key at the rectangular area then dragged it to the below just like the image that i showed. then i combined all the layer that have been created by clicking all the layers for the rectangular then clicked ctrl+E to merged all the layers and named it as slats 1 because i will create slats 2 after this. then duplicated the slats 1 and named it as slats 2. then i hided slats 1 and slats 2
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then i went to the channel pallet, i chose the green layer. then i went to the pop up menu, duplicated the green layer and with the new document then alpha 1 created. made it into grayscale.
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