Dinosaur – 15

This week I’ve been playing with Chroma Key effects. ( If that is the wrong expression, I apologise!! ) To most of us we know this as green-screening, but my attempt this week was actually using a blue background because, in an earlier shot, I had something green that I wanted to retain in the final image – but I later dropped that idea, but stayed with the blue backdrop.

So this is how the dinosaur ended up in Epping Forest. First of all I photographed the animal against a blue background. The objective here is to get the background as evenly illuminated as possible. Not that I succeeded here, but I was able to rectify this later in Photoshop CC.

01-DINASOUR by John Allen

Then, using the ‘Select > Colour Range’ in Photoshop I selected all of the blue and using Select > Select and Mask ( again in Photoshop ) tidied up the selection and created a new layer with a mask of the inverted selection. ( Colour Range selects the background and, of course, that’s not the bit we want in our final image. ) This was the result.

03-DINASOUR by John Allen

Because this is a JPEG copy of that result, all of the pixels I masked out have now been replaced by white. If you save the image as a tiff or psd file those transparent areas ( where there are ’empty’ pixels ) will be preserved.

Next I hunted through my Lightroom library for a suitable new background. This one happens to be Epping Forest, just down the road from me. I copied the images into my working image of the dinosaur and dragged the ‘forest’ layer so that it was positioned underneath the beast.

A few tiny adjustments and ….

02-DINASOUR by John Allen

Success, I would say!!

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