In this quick tutorial I'll show you how tofix under or over exposed areas of your photos in Photoshop.
We start off with this fruit bowl photo whichI took recently.
I'm happy with the overall composition, butsomething just doesn't seem right.
There's under-exposed areas areas of the image whereI've lost all of my detail.
And the same applies to some of the over-exposed areas as well.
This happens because, for now at least, eventhe best cameras have a limited dynamic range.
They just can't perform as well as the humaneye.
To fix this I've extracted two more exposuresfrom my photo, which was taken in RAW format.
But you can achieve the same effect with anolder camera, just by setting up a tripod beforehand and taking multiple shots.
I have one over-exposed image and the otherone under-exposed.
Fortunately these have everything I need to inject detail back intothe poorly exposed areas of my main image.
I start off by selecting my main image andcopying it to the clipboard.
Then I add a mask to my over-exposed image.
I paste mymain image into the mask by going to the channels tab, selecting the mask channel and usingthe shortcut Control-V or Command-V to paste it in.
Once my mask is pasted in I set theblending mode for the layer to Screen.
I then do the same for my under-exposed image.
The only difference being that I set my blending mode for this layer to Multiply instead.
Finally, I invert the mask for my over-exposedimage by going to Image.
You can see this has totally flattened theexposure levels of my image – and not in a pleasant way either.
This is because our masksneed some refinement, so they don't apply to areas of the image that don't need improvement.
To do this we start off with our over-exposedimage mask.
Go to Image.
Levels and then move the center slider almost allthe way to the right.
You'll need to tweak it until you get it just right for your image.
And then press OK.
As you can see, we're starting to get somewherenow.
Next, repeat the same process for our under-exposedimage mask as well.
You can see now that we've injected detailinto the poorly exposed areas of our image.
I'm quite pleased with how this is going,but I'm not completely satisfied yet.
We seem to have injected too much color intothese areas as well.
It just doesn't look right.
Even the human eye isn't capable ofthis.
Fortunately fixing this is easy.
We simplycreate a Hue/Saturation adjustment layer above our folder.
Then we clip it to our folderby hovering over the boundary between the two, holding down the Alt or Option key andthen,when the cursor changes, clicking.
Finally we lower the saturation until it looks justright.
I'm really happy with the improvement to myphoto now.
The poorly exposed areas have been fixed.
And it looks like the photo was takenunder studio lighting, with a much more expensive camera.
And just in case you're curious, the technicalname for this technique is 'Multiple Exposure Bracketing' – so get Googling! That's it for this tutorial.
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