domingo, 31 de octubre de 2010

Como corregir fotos sobreexpuestas con Photoshop

Para cerrar este dueto de notas, su contraparte, para intentar recuperar una foto quemada por exceso de luz. Obviamente, sin información (zonas quemadas por completo), esto no es efectivo, pero, podría servir para intentar mejorar una toma con algún puntito EV de sobra…

How To Fix Overexposed Images

As I mentioned in my "How To Fix An Underexposed Photo" tutorial, the best way to avoid these lighting problems is to adjust your aperture settings, your shutter speed and your film speed when shooting. Ok, so we're going to pretend we did do all of those things but find that we still have a problem image, which can happen when there is too much flash or too much sunlight.

The easiest way to fix an overexposed photo is to open it in Photoshop and chooseImage> Adjustments> Shadow/Highlight (CS-only. For pre-CS look below). You'll see an immediate change in your photo and it will probably be too extreme, but just use this setting as a starting point. Photoshop ships with defaults that are often way over the top. Just play with the Amount Slider and the Tonal Width Slider in both the Shadows and the Highlights until you find just the right balance. And that's it!

Adobe Photoshop tutorial - How To Fix An Overexposed Photo
The above photo is overexposed. The photo suffers from some loss of detail and is just too bright. Below is the same photo after applying the Shadow/Highlight filter.
Adobe Photoshop tutorial - How To Fix An Overexposed Photo
Fixing Overexposed Photos, Pre-CS — The Layer Sandwich Trick

If you don't have CS, then the following trick will help you achieve similar results.
Step 1 — New Layer
Open your photo and make a copy of the Background Layer by choosing Layer> Duplicate Layer, or by dragging it to the New Layer Icon at the bottom of the Layers palette.
Adobe Photoshop tutorial - How To Fix An Overexposed PhotoStep 2 — Change The Blend Mode
In the Layers palette change the Blend Mode of the new layer from Normal to Multiply. This will darken the photo uniformly.
Step 3 — Repeat
Now repeat the entire procedure again. Create a new layer, change the blend mode to multiply, and then take a look at the result. Continue doing this until you go from "it's almost perfect" to "it's ruined!"
Step 4 — Lower The Opacity
Now leave that last layer active even though it's taken you too far and lower the Opacity using the slider at the top right of the layers palette. This lowers the intensity of the effect. When you've found the right amount, you can flatten your image.
Step 5 — Flatten And Save
Choose Layer> Flatten or use the palette’s flyout menu and choose Flatten Image. That's it. Save your file (File> Save) and you're done.

tutorial and images © Jennifer Apple of PhotoshopSupport.com

Fuente: http://www.photoshopsupport.com/tutorials/jennifer/fix-overexposed.html

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