Join John Derry for an in-depth discussion in this video Sampling color from all layers, part of Photoshop CS5: Painting with the Mixer Brush.
Sample All Layers determines whether you paint and pick up color on a single…layer or take all color into account. Whether a Sample All Layers is on or not…will make a difference in the appearance of your strokes. Let's take a look.…Up until now, we've been looking at imagery that's on the canvas, but now we are…going to start talking about layers, and layers provides a great deal of power in…connection with the Mixer brush.…You can start to pick up color from underlying layers, paint on multiple…layers, and build up an image, essentially, in the series of layers, and by doing…so, it creates a safety net that enables you to do things that you might not otherwise try.…
So we've now got a layer on here, and we are going to do a few things.…First of all, the brush I am working with here, you know, it's somewhat wet.…It's not going to run out of paint very quickly, and there is a little bit of…mixed ratio going on, but let's just start by turning off the Load Capability.…And if you remember from before, this makes this a brush that smears.…
- 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.