Artistic Assemblage
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We are going to achieve an assemblage of images of semi-professional quality. Although you may not grasp the principle, you will notice that the Arithmetical plugin offers quite a lot of possibilities.

Mask Creation







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1. Create a new image
Width : 50 (corresponding to the number of pixels of the superimposition)
Height : 600 (corresponding to the common height of the two images)
2. Filter / Color / Gradient
Color 1 : Black, 100%
Color 2 : White, 100%
Direction : Left to Right

3. Canvas size (size of the work area)
Width : 750 (sum of the width of images - number of pixels of the superimposition)
Height : 600
Position : Center
Background : White

4. Fill the left area in black


Adjusting the two images


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5. Activate the first image (the mountain)

6. Canvas size
Width : 750
Position : Left

7. Activate the second image (the sea)

8. Canvas size
Width : 750
Position : Right


Dissolve



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9. Open the Arithmetic plugin

Formula : (I1*(255-I3)+I2*I3)/255

I1 being the mountain, I2 the sea, and I3 the mask
(if the order is different, just rearrange the order in the list)