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View Full Version : Merging Pictures using Adjustment Layers


Stemmy
26th February 2006, 10:39 AM
OK here is a method of easily merging two pictures. I saw it on another forum a long time ago but thought I would talk you through how its done.

You know where the sky is really bright and the landscape is really dark. How to get one perfectly exposed picture. You could meter for the sky but the landscape would be too dark and if you meter for the landscape you would blow the sky out.

So here is what to do. You will need a tripod to keep your camera still.

Take two pictures of the same landscape one metering for the landscape and one metering for the sky. See the original picture.

IMAGE 1 BELOW is the original image metered for the landscape.

http://www.wedding-photography.org/attachments/image1.jpg

IMAGE 2 BELOW is the original image metered for the sky.

http://www.wedding-photography.org/attachments/image2.jpg

OK open both images in photoshop.

Select the darker image and go to SELECT and ALL.

Then go to EDIT and COPY.

You can now close down the darker image.

Now click on the lighter image and go to EDIT and PASTE.

If you go to the layers section you should now have two layers as the image below shows. The background layer as the lighter image and the foreground layer as the darker image. You will only see the darker image as this is the image at the front of the stack.

IMAGE 3 BELOW shows how the layers should look now.

http://www.wedding-photography.org/attachments/image3.jpg

Now go to the layers section and make sure the darker image is selected (as in the above image) now click the icon at the bottom of the layers section that looks like a white circle inside a grey square. This will create a layer mask and the layers section should look like this.

IMAGE 4 BELOW shows how the layers should look now

http://www.wedding-photography.org/attachments/image4.jpg

Now go back to the layers section and click the lighter image to select it.

Go to SELECT and click ALL.

Now go to EDIT and then COPY.

Now go back to the layers pallet.

Now with the ALT key pressed click on the white rectangle next to the darker image. This should select the adjustment layer and the image you see on the screen should go white.

Now go to EDIT and PASTE.

You should see a B&W version of the lighter image on the white image.

If you now go to the layers section and select the background image you should see them blended together as one image as IMAGE 5 BELOW.

http://www.wedding-photography.org/attachments/image5.jpg



Sounds really complicated if you haven't done it before. Copy the images to your computer then print this tutorial. After ten minutes you will get the idea. It actually takes less than a minute to do.

This is a really quick way of getting that perfectly exposed picture.

You can experiment more. Once you get to the section where you have the white adjustment layer viewing in photoshop try adding a gradient or using a brush paint to paint onto the adjustment layer. Then have a look at the blended effect. Loads of playing to be done here.

To give you a quick idea about adjustment layers. Once you have the white adjustment layer viewing in photoshop then select a brush. If you go to the colours palette then select a colour you will notice that only shades of grey and black will paint onto the adjustment layer. If you imagine the adjustment layer dictates how much of the background layer shows through to the front of the image. White means non of the background shows through - black means all of the image shows through. Shades of grey in between mean parts of the background show through.

Have fun.

If you have any problems doing this post here.

lostmysnorkel
28th February 2006, 11:09 PM
Thanks Martin, will try that one.

I achieved similar not so long ago when 'fiddling'. Basically, opened two copies of the same image, used levels to brighten the darler image until the shadow detail was where I wanted it, the dragged it over the original to create a new layer, then used the eraser tool to 'rub out' the blown out bits of the top layer - the bottom layer showing through well-exposed.

Will need to go and fiddle again to remember how I did it, but will try and post it here.

Stemmy
1st March 2006, 01:13 AM
This basically does the same only Photoshop is doing the fiddly bit of the rubbing out.

tonymidd
1st March 2006, 11:00 AM
In CS2 using the HDR merge tool does this automatcally.

StuG
1st March 2006, 02:52 PM
Thanks Martin, I just had a go at this it's really quite easy isn't it once you know how :banana:

Keitht
3rd March 2006, 09:50 AM
Just like to add my thanks. It really is much easier than it seems when you are provided with such clear instructions.

Ref HDR - it only works with RAW files.

Stemmy
3rd March 2006, 11:40 AM
AAAAhhh right Ill stop trying it now. Didnt realise it only works with RAW images.

Keitht
4th March 2006, 02:41 PM
Ref HDR - it only works with RAW files.

Not for the first time, and probably not for the last, I have made a statement that is total bo**ocks :)

My mis-interpretation of the coverage given to HDR in Scott Kelby's book (entirely in the Mastering RAW section) was that it only worked with RAW. Had I taken the time to look in the CS2 HELP texts I could have avoided the embarrassment of typing this. :russian_r

The alternative would have been to edit my original post and make Stemmys sarky, but valid, comment seem misplaced.:grin:

Stemmy
4th March 2006, 02:44 PM
No it wasnt sarky.

I was trying to have a go at HDR with Jpegs and it just kept saying.

"Not Enough Dynamic Range to complete the task".

When I read your post I thought that was my answer.

So you can do it with Jpegs. Then why am I getting this Dynamic range issue.

I was only using some very low resolution pictures.

Keitht
4th March 2006, 09:47 PM
No it wasnt sarky.

I was trying to have a go at HDR with Jpegs and it just kept saying.

"Not Enough Dynamic Range to complete the task".

When I read your post I thought that was my answer.

So you can do it with Jpegs. Then why am I getting this Dynamic range issue.

I was only using some very low resolution pictures.

I have experienced the same with low res pictures. The Help Files on CS2 say "File Formats Photoshop (PSD, PSB), Radiance (HDR), Portable Bit Map (PFM), OpenEXR, and TIFF." No mention of Jpeg, but if it doesn't work with Jpegs why does it accept them as input??

Edited to add: I am experiencing the same problem with TIFFs as well. Hopefully somebody with experience of using HDR can say whether what I was attempting should work.
I had a RAW image which I saved, without any changes, as a TIFF. I then created 2 other TIFFs from the same RAW image, one after reducing exposure by 2 stops and one after increasing exposure by 2 stops.
I had hoped to be able to combine these images into one final image. There was definitely detail visible in the -2 and +2 images that wasn't visible in the original. Am I expecting too much and if so what is wrong with the logic I am applying.

Keitht
10th March 2006, 12:06 AM
If anybody is interested, I found the answer to my own question here.

http://www.adobe.com/support/techdocs/331736.html

Basically saving the same RAW file with different settings will not work. It requires seperate images.