Với người mới học digital painting thì họ sẽ có cảm giác như lạc vào một mê cung và brush là một trong các mê cung đó. Muốn vẽ một bức tranh tất nhiên là phải biết cách dùng cọ, mà để dùng được cọ thì trước tiên phải hiểu được nó
- quẹt thành vệt
- nhấn : đậm, to
- không nhấn nhỏ, mờ
Chúng ta hãy đi từ cơ bản nhất
Một cái chấm cọ cho thấy đầu cọ có hình dạng gì?
Đường cọ có hình dạng ra sao?
Thuộc tính
ĐẦU CỌ
Hình dạng
Nét cọ liền và nét cọ chấm
Chất liệu
Độ trong suốt và lực nhấn
- Nét cọ mờ
- Nét cọ mờ trước
- Nét cọ mờ sau
Độ xốp
NÉT
Nét liền - Nét đứt
Nét vuốt (nhỏ dần)
- Nét vuốt trước
- Nét vuốt sau
- Vuốt trước và sau
Chất liệu
STROKE
Nét cọ vẽ trên màn hình là do nhiều điểm (points) nối tiếp nhau
Stroke Plot
- Spacing (khoảng cách): là khoảng cách giữa 2 điểm. Tăng Space nét cọ càng đứt khúc. (dash)
- Jitter: Jitter refers to the amount of distance by which your shape will be offset from the stroke plot. Smaller values will look more like a solid line, while higher values will spread the shape out and hide the visible line you draw
Stroke taper (nét vuốt, đuôi nét)
- Start stroke taper: nét cọ bắt đầu từ nhỏ lớn dần. Tăng giá trị này đoạn khởi đầu càng dài
- End stroke taper: nét cọ kết thúc nhỏ dần, tạo hiệu ứng vuốt cọ. Tăng giá trị này nét vuốt càng dài
- Opacity stroke taper: độ mờ khoảng nét vuốt. Giá trị này càng tăng, khoảng vuốt cọ càng mờ
- Size stroke taper: điều chỉnh kích thước nét vuốt nhỏ dần.
SHAPE
Shape là hình dạng của điểm. Sự phân bố của điểm tạo ra đường (Stroke).
Shape là mảng, phần bên trong của mảng là grain các điểm này
Shape như 1 lần đóng dấu, và các dấu liên tiếp tạo nên A shape is just like a stamp. The image you select as the Shape will be repeatedly 'stamped' over the course of a stroke. You could also think of the Shape as a container for the grain.
Shape
- Scatter: Changing scatter will change the orientation of your brush as your stroke progresses. Higher values will give a messy, rough feeling while low values will be like a streaky brush. Scatter is not affected by brush direction.
- Rotation: The rotation slider affects how your brush reacts to directional change. A range of unique effects can be achieved from a flat calligraphy brush to ribbon effects. The rotation slider has three main points:
‘100% Inverse’ makes the shape rotate inversely to stroke direction.
'Static' locks shape direction to remain static.
'Follow stroke' causes the shape to follow your painting direction. - Randomized: When OFF—Initial shape direction is based on the stroke’s beginning. When ON—direction is different for the beginning of every stroke. This can give each stroke a unique behaviour and a more organic feel.
- Azimuth: Azimuth is used for brushes where the direction of the brush shape on the canvas should be the same as the direction of the Apple Pencil, just like a calligraphy pen nib.
Turning Azimuth ON will make the shape follow the perpendicular angle of Apple Pencil.
Grain
As you’ve already learned, Procreate brushes are created using dual images. While the shape acts as a container for the grain, the grain itself acts like a paint roller. When you paint a stroke, the grain is ‘rolled’ inside the shape and on to the canvas.
- Movement: When set to 'Stamp' the grain texture will not roll at all. Instead it will smear the grain. When set to 'Rolling' the grain will apply its texture just like a repeating paint roller.
- Scale: Grain scale adjusts the size of the grain texture inside the shape
- Zoom: When set to 'Follow size' the grain will scale with your brush shape. When set to 'Cropped' the grain is locked and the brush shape will scale independently, from the grain. A great way to understand how zoom works is to use the precision slider preview.
- Rotation: Grain rotation is very similar to Grain movement. This setting will smear and slur the grain image–based on directional stroke changes. The rotation slider has three main points along the slider:
- ‘100% Inverse’ makes the grain rotate inversely to stroke direction.
- 'Static' locks grain direction to remain static.
- 'Follow stroke' causes the grain to follow your stroke direction.
- Filtered: ON applies Antialiasing to your grain texture. OFF can cause the grain to become jagged and coarse.
DYNAMICS
These settings are applied on-the-fly when you draw and paint. Dynamic settings allow you to create incredibly unique brushes.
color mix:
- Falloff: Affects the overall length of the stroke. All effects will be applied within this setting.
- Dilution (Độ pha loãng): Dilution is directly related to the Paint characteristic. Varying values of dilution will create different levels of ‘water’ in your paint. When a high amount of dilution is applied to your brush, the brush will mix and pull more paint as you drag it around.
- Charge: Charge refers to the amount of virtual paint applied to a brush. For instance, when set to ’0′ the virtual paint will ‘run out’ almost instantly. The Charge setting is great for traditional artists!
- Glazed: When ON, your brush will paint in a uniform transparent manner and will no longer 'build up' over time. Because of this, the Glaze effect behaves exactly the same as default Photoshop® brushes.
- Accumulative: This option only works when Glaze is active. When ON the shape will ’build up’ as the stroke is made.
- Flow: This option only works when Glaze is active. Flow will determine the amount of paint applied to an area every time the brush moves.
Opacity Variance
Opacity Speed: Opacity will vary depending on the speed of your stroke.
Opacity Jitter: The stroke will vary in opacity as it is stamped across the canvas.
Size Variance
Size Speed: Size will vary depending on the speed of your stroke.
Size Jitter: The stroke will vary in size as it is stamped across the canvas.
PENCIL
Tailor Apple Pencil exactly to your needs. If you are using a supported 3rd party stylus, pressure and size will also adjust your stylus. Tilt is only available with Apple Pencil.
Pressure Opacity: When set to 0% the brush will not react to pressure changes. When set to Max, more pressure will make the stroke opacity stronger. When set to 100% inverse, more pressure will make the stroke transparency increase.
Pressure Size: When set to 0% the brush will not react to pressure changes. When set to Max, more pressure will make the stroke size bigger. When set to 100% inverse, more pressure will make the stroke size smaller.
Pressure Softening: When set to 0%, any changes in pressure will be immediately acted upon. Larger values will smooth out the pressure response, which is excellent for getting gradual changes with glazed brushes. Lower values give brushes a quicker response to changes in pressure.
Tilt Opacity: When size is set to None the brush will not react to Apple Pencil tilt changes. When set to Max tilting Apple Pencil will aggressively make the brush size bigger.
Tilt Size: When opacity is set to None the brush will not react to Apple Pencil tilt changes. When set to Max tilting Apple Pencil will aggressively make the brush fade off vertically.
GENERAL
Here you will find general brush characteristics which apply to the brush overall.
Properties
Orient to iPad Screen: When ON, oriented will cause the brush to orientate itself according to the iPad screen orientation
Use stamp preview: When ON, stamp view will cause your brush preview to display only the brush shape file. Stamp view can be very useful when the grain is not a significant part of the brush.
Size limits
Max size: Maximum size is responsible for determining the maximum radius that the brush can reach. By default, all brushes can reach 100% radius. However, if a brush has a spacing value greater than 12%, the brush can reach an incredible 400% radius. Essentially, more spacing allows bigger sized brushes.
Min size: Minimum size is responsible for determining the minimum radius the brush can be lowered to.
Opacity limits
Max opacity: Maximum opacity is responsible for determining the maximum amount of opacity the brush can reach.
Min opacity: Minimum opacity is responsible for determining the minimum amount of opacity the brush can be lowered to.
SOURCE
This tab contains the source images that create the foundation of a Procreate brush. One image for the shape of the brush, and one image for the grain of the brush. You are free to modify or alter any brush source file you please.
Shape source: Tap to import a Shape image. Tapping the Shape Source thumbnail will allow you to import you own source images into your brush, or use an image from the Pro Library. Procreate will accept almost all image formats, including JPEG, PNG, TIFF and GIF
Pro tip: Note that white areas of the image will cause the brush to apply paint and black areas will be transparent.
Grain source: Tap to import a Grain image. Tapping the Grain Source thumbnail will allow you to import you own source images into your brush, or use an image from the Pro Library. Procreate will accept almost all image formats, including JPEG, PNG, TIFF and GIF.
Custom Brushes » Re: free aniaml fur and scales texture jpeg
After a bit more messing around, I found that to get the kind of brush I wanted it wasn't quite as I said, so I created a scaly brush as an example. You can get a copy of it here:
http://obscurestar.deviantart.com/art/Procreate-Sea-snake-Brush-611572951
If you edit the brush and take a look, you can see I did a few things.
First off, I created a modified version of the texture by:
* Opening the texture in photoshop.
* Creating guides at 150px in X and Y. (Since the images Pexen provided are 300x300)
* Selecting the gradient tool and then 'Radial Graident'
* Create a gradient that goes from clear to black.
* Click the gradient at the center (where the guides cross) and then drag to the edge of the window (on either axis) This creates the scales faded out to black image you see in Shape Source on my brush.
You can use any tool to do this. In Procreate for example you could:
* Open the image.
* Add a layer.
* In Tools, select 'Insert' and then import a black and white radial gradient.
* Set the gradient layer's blend mode to Multiply.
* Export the image to a JPG or PNG
This modified texture will help create a brush that flows better for following the motion of the stylus.
Next, I played with the settings to get what I wanted.
You can see if you look at the Source for the brush, I rotated the shape source so that I could paint from head-to-tail with the snake brush. The grain source, I just chose a texture I had laying around. White would work but a texture with some grain to it makes the brush a bit more interesting.
The Stroke Spacing is the tricky bit. I couldn't get this to work right on its own so I went into Dynamics and turned on Glazed (you can see my settings in the brush) Then I went back to Stroke Spacing and moved the slider until I got a smooth-looking scale pattern in the preview. (you can see it's not perfect but it was good enough for me)
Then I set Shape's rotation to 'Follow Stroke' and after that just played around with the size and taper until I got something that was comfortable for me to control. (Again, you'll probably want to tweak this to your own preferences)
That's about all there is to it. Though I would also suggest that as you tune your brush, duplicate the brush before you make changes. That way you have a backup.
Try playing with different shape overlays and see what you get!
Good luck!
