Join John Derry for an in-depth discussion in this video Adjusting bristle length, part of Photoshop CS5: Painting with the Mixer Brush.
Length controls how long your brush hairs are.…Just like its traditional counterpart, you can control whether or not your brush…has long, medium, or short bristles.…The longer a bristle tip is, the more potential you have to make different marks,…based on how hard you press this bristle tip against the canvas.…We will start here with the Length slider.…You won't see a whole lot of difference in the preview at the bottom of…the Brush panel, but you can certainly see it in the 3-D Preview up at the upper-left.…
Length definitely changes the way this brush works.…Let's start with a very minimal length brush.…So, I'll just paint a few strokes, and it's great, works nice.…I can see some of my bristle hairs, but let's take the Length up aways.…Now, what happens is, and this is very interesting, when I put my brush at a…shallow angle, I can start to actually use the entire width of the length of that…brush to start to get a very wide stroke.…
Now, let's take it all the way up to its maximum.…It works, but it depends on your system.…
- Understanding the axes of motion with a Wacom tablet
- Choosing a brush shape and Bristle Tip
- Adjusting brush angle
- Loading color and control the behavior of the Mixer Brush
- Modifying surface texture
- Simulating the texture of canvas
- Saving tool presets for brushes
- Creating a painting from a photograph
- Painting from scratch with the Mixer Brush
Skill Level Intermediate
Q: What factors affect how well the mixer brushes in Photoshop perform? Does document size (i.e. 72dpi vs. 240dpi) affect the performance of the brushes? How can I maximize brush performance?
A: The recordings for this tutorial were generally done at a standard screen resolution, but a real-world situation will often require higher resolutions. For example, offset printing generally dictates files at 300ppi (pixels per inch). Inkjet printing is often discussed in terms of 240ppi. For web-based viewing, imagery at 72ppi is considered acceptable. You can easily determine the pixel resolution of an image by multiplying the size in inches by the above ppi (pixels per inch) factors.
Let's use a typical real-world size as an example: 20" X 24". This is a common photographic print and frame size.
72ppi = 1440p X 1728p = 2,488,320 pixels
150ppi = 3000p X 3600p = 10,800,000 pixels
300ppi = 6000p X 7200p = 43,200,000 pixels
Note that each of these resolution factors quadruples the total pixel count.
It is the amount of pixels being manipulated that dictates both application and brush performance. With this in mind, we can state that performance decreases as image pixel size increases. There are three primary factors that affect an application's ability to handle large pixel-based manipulation.
For the full FAQ, please download the PDF file here.