User Manual

Image Broadway 6 Help
Brush and Retouching > Blending Mode
Blending Mode
How pixels in an image are affected by a painting or editing tool is defined by the painting mode. It blends the color
you paint with the underlying pixels. Painting modes are similar with layer blending modes. The following notations
are used. The original color (O) is the original color in the image, the blend color (B) is the color being applied with
the tool or function, and the result color (R) is the resulting color from the blend. We will explain each mode in the
following sections.
Normal Mode
Normal mode is the default for all painting and editing tools where the blend pixels are visible and the original
pixels are not. The blend color paints over the original color.
Dissolve
Dissolve mode works by allowing the blend color to replace the original color some pixels in a random way. For
the Dissolve mode to have an effect, the original image must have an alpha channel. You can use Image/Add
Alpha Channel to do so.
Behind (Paint mode only)
Edits or paints only on the transparent part of original image, and works only in when Lock Transparency is not
set.
Color Erase (Paint mode only)
Erase the foreground color and replace it with partial transparency.
Multiply
You multiply the values of the original and the blending images in each channel and divided by 255. The image
will be darkened since each multiplied number divided by 255. But, using white blending image leaves original
image unchanged. When you're painting with a color other than black or white, successive strokes with a
painting tool produce progressively darker colors. The result color is: R=B*O/255.
Divide
You multiply the values of the original by 256 and divided by the blending images plus one (to avoid overflow)
in each channel. The image will be lighten since each divided number multiplied by 256. But, using white
blending image leaves original image unchanged and black blending image leaves the result image as white.
The result color is: R=O*256/(B+1).
Screen
It projects the blending image to the original image and with a lightening effect on the image. The result color
is: R=W-((W-B)*(W-O)/255). W is the white color.
Overlay
It overlays the blending image with the original image. The result color is: R=O*Rs+(255-O)*Rm. Rs is the
result color of Screen mode. Rm is the result color of the multiply mode. If the original color is lighter, then
screen mode dominates and makes the picture progressively lighter.
Difference
It uses the absolute difference between the original and the blend images. The result color is: R=|B-O|.