Superman said:
However, I would like suggestions of how to edit them in Photoshop as example for the CRS shrimp one just to leave the shrimp red and white and the rest being grey scale.
Depends a bit on what version of Photoshop you're using.
saintly said:
create 2 layers of the same image, desaturate the top image and then use the eraser tool on the bits you want colour. not sure if its right, but it works.
saintly's suggestion is the easy way, but your control over light, contrast, shadows and higlight is limited when using Desaturate in PS.
A fairly easy and fun way is to have two layers of the original image, as saintly suggested.
Make the top layer "invisible" by clikcing the small eye icon next to it in the Layers window.
Between the two layers you add a "Channel mixer" adjustment layer. Give it a name and click OK.
Tick the Monochrome box in the lower left corner. Play around with the sliders until you get an image you like, but the sum of all three channels should be 100, to preserve the original luminosity. You can get a really cool shadow or contrast effect if you move one of the sliders into the negative numbers. Your image might turn black at first, but just move one of the other sliders more to the right.
If you are using PS CS3 it's even easier. Instead of adding an adjustment layer, you go into "Image > Adjustments > Black & White" and play around with the sliders until you're satisfied.
Make the top layer visible again and click the "Add layer mask" button (or "Layer > Layer Mask > Reveal All"). Note you now have what appears squares on the same layer in the Layers window.
Click the right one (the layer mask) and select the Brush Tool (B). The colour palette changes to black and white. The areas of the layer mask you paint black will become transparent, revealing the underlying B&W layer.
Paint around the shrimp. Don't worry if you paint over the shrimp, just swap to the white colour and paint over the areas "deleted" and they will return. If you select a brush with blurry edges you will get a soft transition between the areas that are visible and the ones that aren't.
When you're done "cutting" out the shrimp, you can try applying a couple of filters. In the example below I just gave the saturation a bit of oomph
The rock could really use some tweaking to bring out more structure, but I'm at work and couldn't spend more than five minutes doing this
Have fun!