I've been using Adobe Photoshop for years now but it's only recently that I've started to understand exactly how powerful it is when you need to color your graphics.
I made two drawings last night (above); A "Warhammer-ish" Soldier and a "Mechwarrior-ish" Mech. Anytime you're dealing with mecha, you expect a lot of little details. And the debris-strewn backgrounds did not exactly make my job any easier. Imagine if I had colored them by hand, I would've taken at least a day for each.
- First I'd make photocopies of the original.
- Then, using a copy, I'd paint on the drawing with the color scheme I had in mind.
- If I didn't like the colors, I'd have to start all over again with a fresh copy.
- Once I'd finalized a color scheme, I'd start on the final working slower to avoid mistakes.
- By then I'd have wasted a lot of time, paper and paint.
With Photoshop however, I can just put each color, shading or detail in its own layer and modify them separately. I just set my drawing's layer to "Blending:Multiply", adjust my brush size, pick out my color and start painting. Later on, if i want to change a color, I just fiddle with the hue/saturation.
But the biggest advantage to using Photoshop is the "Undo" option. Working manually, every error you have to erase or paint over mucks up your paper. You can only make so many corrections before your paper is worn thin or soaked through. With Photoshop, it's just a quick Ctrl+Z and your mistake never happened.
Of course, Photoshop will not magically enhance your work. In fact, it probably requires a lot more skill and practice to than to color manually. And even if it cuts down your work time, you should still expect to spend long hours at your desk. (My two drawings took about 6 hours to color)
The drawbacks? Well, while you DO get a more polished look with Photoshop, you also lose the style and charm of a hand-made drawing. Digital coloring MIGHT be more expensive sometimes due to electricity consumption. However, considering the price of paint plus the power consumed by your drawing lamp, I think it costs you about the same.
If you'd like to view some solid tutorials on coloring with Photoshop check out these links.
Lynda.com: Photorealism with Bert Monroy* [lynda.com] - A good starter guide for working with layers, blending options and the various color-adjust and shading options that Photoshop has to offer. According to the site, this tutorial has 5.5 hours worth of video, so you'd better be ready to sit at your desk for a long while. Luckily, the tut is divided into parts, so you can have breaks in between. Cred to Mon showing me this years ago.
*(note: Photorealism with Bert Monroy now requires a Lynda.com subscription to view.)
Bolt-City: Guide to Copper [boltcity.com] - Shows the whole drawing-to-coloring process of Copper, a comic by Kazu Kibuishi. It has tips on scanning and clening a line drawing; something which the Lynda.com tutorial lacks. Cred to Martin for pointing me to this, and many other fine comic resources.
How to Make Blastwave [blastwavecomic.com] - A tutorial on how Kimmo Lemetti (aka: Morr) creates a page of "Gone with the Blastwave". It describes several techniques about painting with Photoshop and also a few tips on planning your Page-layout. There's even a video of him doing the actual work (camtasia screen-capture) which shows you just how fast a pro can go.