Superimposition

[woolno]

I use Paint Shop Pro Photo XI

I have two jpegs - one an aerial photograph, and one a survey plan ( black lines on a white background )

I wish to superimpose the survey plan on the photo ( and perhaps move it and change size a bit )

Does anyone have step by step instructions which are idiot proof?

[LeviFiction]

If I had idiot proof instructions then even I could follow them. Sadly that's never the case.

If you just want the white lines superimposed over the image you just need to set the blend mode to Screen.

Okay so here's what we do.

With both images open duplicate the Aerial view image. (Shift + D or from the Window menu select "Duplicate") and close the original. This allows you to edit the image without accidentally destroying the original one just in case something goes wrong.

Second select your survey plan image and copy it to the clipboard (Ctrl + C or Edit->Copy)

Select the Area view image again and then paste the survey plan as a new layer ( Ctrl + V or Edit-> Paste as New Layer)

In your layers palette (if you don't have the layers palette active you can turn it on by going to the view menu and selecting View->Palettes->Layers.) you should see the two images. The aerial view on the bottom and the plans on top. You should also see a drop down box that says "Normal" inside of it.

Make sure you have the Survey Plan layer selected and then change blend mode from "Normal" to "Screen" this will remove all of the black from the layer allowing the bottom layer to show through. So it should now look like there are white lines superimposed on the background.

If you need to resize the plans layer grab the pick tool (the white arrow cursor button or keyboard shortcut of K) and make sure the mode in your tool options is set to "Scale" this will allow you to stretch and move the layer around. Keep in mind, however, that you don't want to do a lot of stretching as each time you do the image is distorted. And each distortion either adds pixels that weren't originally there or destroys pixels that were. So you want to make as few adjustments as you can.

That's the best I've got.

[woolno]

Thanks
The problem is that on the survey plan the lines I want to keep are black, and the background is white - so what do I do differently?

Thanks

[LeviFiction]

Could try Multiply. It's a near opposite of Screen.

Screen lightens an image, the reason black disappears is because of the end result of the mathematics.

Multiply darkens an image, the reason white tends to disappear is again because of the end result of the mathematics.

[teknisyan]

You may also want to try blending both image together.

Here's a tutorial I made with PSP X2 Ult but I assume you can following this with PSP X1.

http://abielonline.blogspot.com/2009/01 ... p-pro.html

[LeviFiction]

I just told them to blend the photos....you're not making any sense Abiel, but the tutorial does add the visual aspects.

One other option is to use blend ranges. Though it seems more complicated than it really is, it's as simple as moving a few triangles around.

http://www.the-graphics-tablet.com/blend-range.html

[teknisyan]

I just thought the mine is more of a "fool" proof than "idiot" proof.