Apple Macintosh PhotoFlash - Manual (Page 90)

PhotoFlash applies the exposure settings you specified to the frontmost
window. If the window contains an image that includes a selection,
PhotoFlash applies the new settings to the selection only. If the window
contains a catalog with selected thumbnails, PhotoFlash applies the
new settings to the images they represent and ignores any selections the
images contain.
Adjusting brightness and contrast
You can use the Brightness/Contrast command in the Enhance menu to adjust
the brightness and contrast of a selected area, a single image, or multiple
images represented by selected catalog thumbnails.
Make sure the window you want the command to affect is frontmost, then
follow these steps:
1 Choose Brightness/Contrast from the Enhance menu.
The Enhance dialog box appears.
If you click on the image itself while this dialog box is open, the place you
click appears in the Before and After boxes.
2 Adjust the Brightness and Contrast slider as necessary to achieve the look you want.
80 Chapter 5
View of current image View of image after
brightness and contrast
have been adjusted
Drag this slider to make the
image lighter or darker.
Drag this slider to
increase or decrease
contrast between
light and dark areas.