The Glow lets you generate subtle gradations
of light in your composition.
The Glow tool has the
following parameters:
- Threshold Lets
you determine which parts of the image (usually the brightest) you
want to apply the glow to. You can base the threshold either on
a channel; Red, Green, Blue or Alpha, or Luma, or on a color component
of the image (R,G,B or overall luminance). Values that fall above
the set threshold will have a glow applied and values that fall
below the threshold will be set to black.
- Gain Colors
the glow you apply to an image.
- X Radius and Y Radius Applies
a blurred edge to the glow. Using the Master slider will apply a
blurred edge to both the X and Y radii uniformly. You can also select
a single color component or select just the X or Y parameter to
apply the blur to by deselecting the Lock button located at the
right of the button.
- Output Mode Choose
between working with either the composite of the image you are working
with or just the glow applied to it. If you select Composite, it
applies the blend mode selected.
- Blend Select
the blend mode you want to apply to the glow. Select Blend to display
available blend modes.
To set the threshold:
- Do one of the following:
- Drag the trackball towards the color
you want to set as the threshold.
- Drag any of the red (R), green (G), or
blue (B) channel fields to the right to increase, or to the left
to decrease the threshold uniformly on all three channels. Alternatively,
you can also drag the luminance (L) field to achieve the same result.
Select the Reset button to return all values to 0.
- Select a single channel that you want
to modify by deselecting the Lock button to the right of the channel,
then increase or decrease the threshold. The other channels are
not affected. However, the overall luminance field updates to reflect
the change. Select the Reset button to return all values to 0.
- Type values into the channel fields and
press Enter. In the
case of modifying all channels uniformly, when values are typed
into any field, the other fields update. The luminance field will
update regardless of which method is used to modify the values.
Select the Reset button to return all values to 0.
To set the gain on a glowed portion of
an image:
- Do one of the following:
- Drag the trackball towards the color
you want to add or decrease gain to.
- Drag any of the red (R), green (G), or
blue (B) channel fields to the right to increase, or to the left
to decrease the gain uniformly on all three channels. Alternatively,
you can also drag the luminance (L) field to achieve the same result.
Select Reset to return all values to 0.
- Select a single channel that you want
to modify by deselecting the Lock button to the right of the channel,
then increase or decrease the gain. The other channels are not affected.
However, the overall luminance field updates to reflect the change.
Select the Reset button to return all values to 0.
- Type values into the channel fields and
press Enter. In the
case of modifying all channels uniformly, when values are typed
into any field, the other fields update. The luminance field will
update regardless of which method is used to modify the values.
Select the Reset button to return all values to 0.
To set the X or Y Radius to the edge
of a glow:
- Do one of the following:
- Drag any of the red (R factor), green
(G Factor), or blue (B Factor) channel fields to the right to increase,
or to the left to decrease the radius uniformly both the X and Y
radii. Alternatively, you can also drag the Master field to achieve
the same result on all color factors.
- Type values into the channel fields and
press Enter. To deselect
the lock on any parameter, click the Lock button.
