Epson Photo Plus - PhotoPlus Color Photo Scanner User's Guide download pdf (Page 131)

Manipulating Images 119

To select specific channels for edit:

1. Select the Channels tab. All channels are switched on and are shown by

default.

2. Click on the channel you want to select—the other channels will be

deselected and hidden automatically. Use Shift-click to include additional

channels if necessary.

3. Apply the adjustment, special effect, painting operation, etc. to the selected

channel(s).

Interpreting histograms

The Histogram tab is used to view the distribution of colors and tones spread

throughout your current selection, selected layer or entire photo (by default).

This gives an opportunity to view and interpret a complete snapshot of the range

of colors and, most importantly, the distribution of pixels that adopt those

colors.

The histogram doesn't carry out any adjustments by itself, but it is useful for

evaluating the kinds of image adjustments that may be needed. This decision is

up to the user and his/her own personal judgment.

pixel

count

0<--------------tonal range----------->255

For example, we'll

use the composite

RGB channel for

clarity (although

you'll get all colors

by default). Think of

the histogram as

being split into three

portions—(A)

Shadows, (B)

Midtones, and (C)

Highlights.

For any channel, the horizontal X axis represents the range of tones, each

tone is at a specific level.

1 2 ... 126 127 128 129 130 131 132 133 134 135 136 ... 285 286

No comments

Epson Photo Plus - PhotoPlus Color Photo Scanner User's Guide Page 131