Originally Posted by roach711
PD - Is that "real" blood or did you do it in post processing? I'd love to know how you did it.
All added in post. Before and after:
You can use Photoshop for this, but I used a Mac-only app called Pixelmator. It doesn't have all the tools of PS, but it can do enough and it costs less than ten percent of what you'd pay for a new copy of Photoshop.
To make the blood, I created a new layer and painted in the areas where I wanted blood. I named this layer "blood." I paid close attention to the facial features and tried to follow a logical path around the nose and eyes and creases that would normally disrupt the flow of blood. I just used a solid color like white to make it easy to see what I was doing. I'm especially proud of the blood in the lips.
Then I created another layer ("blood color") and linked it to the "blood" layer with a clipping mask. Into this layer I painted the blood color. The colors only showed up where the previous layer was already placed due to the clipping link. It was easiest to use a wide brush to completely cover the mask and then fine tune the colors with a narrow, soft brush. I started with a nearly-black red, then brushed in some more saturated red along the edges where the blood would be thinner.
At this point, it will look like a red-black paint applied to the top of the image, but changing the "blood" layer's blending mode to Hard Light and reducing the opacity (just slightly) allows a little bit of the underlying texture to show through, especially where the blood is more red than black. (The "blood color" layer adopts the blending mode of the linked clipping mask.)
I used a blur tool to soften the edges of the blood layer where the original image is slightly out of focus. (Sharp blood on top of blurred skin just looks wrong.)
I added another layer ("blood highlights") and painted in the reflections of the light source, again taking care to match the already existing reflections in the eyes and again softening the highlights where the original image is out of focus.
I watched a couple YouTube videos after I finished these to see if anyone had any tips or tricks that would make this easier next time, but many of the "tutorials" are done by teenagers with no patience and no teaching skills, so they are way too fast and hectic to be of much use, and the results were often not realistic. The best results were done by people using full copies of Photoshop and using advanced techniques that I think the average person wouldn't grasp without a lot of time using the software. Pixelmator is easy to use and costs only $40. I'm sure there are probably Windows-compatible editing apps available that would do the same thing.