Airbrush
Use this tool to for image manipulation and texture generation.
Main slider controls
- canvas size - some preset canvas sizes
- feature size - size of textures and other features
- quantity - controls the number of items drawn
- opacity - controls transparency of drawing
Basic features: Row of icons
- Select color
- Random color
- Load image: select an image file to load into the canvas
- Download the canvas as a PNG file
- Flip canvas horizontally
- Flip canvas vertically
- Rotate 90 degrees
- Rotate -90 degrees
- Expand canvas
- Shrink canvas
- Add margins: all 4 sides
- Add bottom margin only
- Paintbucket: fill the canvas
- Convert to greyscale.
- Invert colors
- Clear the canvas
- Info: show this page
- Debug: show canvas properties
Basic image adjustments
Click the plus and minus buttons next to an adjustment to increase or decrease the effect.
- sharpness
- saturation
- contrast
- brightnesss
- warmth
Effects
There are five types of effects. Select an effect and then click the icon to the left of the effect to draw it.
- Transformations
- Textures
- Lighten/darken/fade
- Paint
- Filters
Mode
Refer to 'globalCompositeOperation' and use the default unless you know how to use this feature.
- Use destination-over to draw only on transparent areas. Usefull if you want to fill in a background withot overwriting existing drawing.
- User source-atop to only draw on non-transparent areas. This leaves transparent areas unchanged.
- Use destination-out to 'erase'. Drawing a texture in this mode removes it from the drawing.
- Use color mode to tint the canvas to the selected color (with the paintbucket tool).
Other functions
Text tool: links to the Text tool page, where you can generate text in different styles and colors.
grunge: when this is enabled most effects are modified - generally adding more randomness to the result.
Touch or click the canvas to select the left-most point for the "left clip" and "left rip" functions. The red indicator bar above the canvas, shows the area that will be deleted or cleared
How to make a paper-like texture
- Clear the canvas.
- Set feature size, quantity and opacity sliders to the middle.
- Set the paint color to white.
- Select and draw the streaks texture two or three times.
- Change the paint color to black.
- Draw streaks two or three times.
- Experiment with the three slider settings and try the different textures.
How to make a background transparent
Assumes you have a picture where you want to remove the sky from the background.
- Use the color selector to select the same color as the sky. Maybe white or light blue.
- In the filter drop-down, select "filter selected".
- Adjust the opacity slider to about 2/3.
- Click the filter button.
This should remove some of the sky's color. If there are darker shades in the sky, reselect the color and repeat the filter. You can also try a lower opacity threshold. Save the image as a PNG file.
If grungy is checked, the background color will only become partially transparent.
How to make a double exposure
- Start with two images that are close to the same size.
- Open the first image.
- Click the blue clipboard button. This copies the image to an offscreen buffer.
- Open the second image.
- Set the opacity slider to half and mode to "source-over".
- Click the blue paste button (to the right of the clipboard).
- The images are combined.
- Try differnt modes: lighten, darken, color, etc.