Q: can i create ¨photoshop type" brushes in painter?
A: not exactly no. the differences in the brush engines of painter and photoshop make it very difficult to create brushes that behave in similar ways in the opposing app. having said this it does not mean that certain effects cannot be achieved in either app, using the right technique you can do almost anything the other app can do, of course this usually means investing considerably more time and effort than is required in the app you are trying to mimic.
Q: But why can´t i create the simple hard round brush from ps in painter...... its just a simple brush isn´t it?
A: this boils down to one thing, how opacity works in each app. in photoshop opacity is stroke based, in painter it is dab based. a dab is what a single touch of the brush looks like i.e.the image you use for a custom brush, for the simple hard round brush in ps it is a solid circle. a stroke is a a collection of overlapping dabs. now to how this effects what you can and can´t do. AS you draw you get overlap on the edges of dabs as they cross over each other to form the stroke. when you lay in a single dab in painter or ps of the same color and opacity with a basic round brush you get exactly the same effect. the problem is this is the only time the effect is the same.notic e how in painter as you change the spacing settings not only the contour of the stroke changes (AS IN PS) but the actual opacity changes also. this is because any part of a dab that overlaps another dab will add the same amount of opacity to the one below it.therefore spacing has a bigger effect on how the brush strokes look in painter, the more dabs that over lap in one area the darker the stroke will appear. in photoshop the opacity setting sets the upper limit of the opacity of a single stroke(defined by from when the pen touches the pad until it is lifted) if it is set to 10% any overlap of the dabs that exceed 10% opacity are automatically discounted and with opacity set to 10% you can cross over your stroke with itself without changing the opacity so long as you don´t lift the pen.in painter every time a dab crosses another it will add the opacity of the new dab without exception.
for strokes to look smooth there has to be overlap, this is where the problem lies for painter. but painter does have a feature to combat these unsightly overlaps, blend. so in painter to get rid of the overlapping edges of dabs you have to use the blend setting. this would be fine except for one thing that makes mimicking the simple round ps brush not possible, stroke cross over. say you ar shading and area with a zig zag stroke, every time the stroke crosses itself it will be darker, sticking out like a sore thumb.
Q: i don´t understand, you say you can´t create ps type brushes but you can mimic the effects, what does that mean?
A: Basicly you need to understand how ps makes its brushes look that way and then use what painter has to offer to do the same in a long winded manner instead of thinking of what painter can´t do, because there is nothing you can do about that. there is a way to set the upper limit of the opacity of a stroke in painter too. simply create a new layer and stroke at full opacity (with or without Pressure set in expression) on the layer then change the opacity of the layer and drop it. this is however a considerable burden on work flow, but it is the only viable solution i know of.
if this isn´t explained propewrly or is to complicated to understand please reply and i´ll try to make it