Problems With Image Appearance - Adobe PHOTOSHOP 5.0 User Manual

366 APPENDIX
Troubleshooting
Problems with image
appearance
Printed image appears different from image
on-screen.
For accurate color printing, it is essential to
calibrate your monitor and the Adobe Photoshop
program for the various factors that affect the
printed output. See Chapter 4, Choosing a Color
Mode, and Chapter 5, Reproducing Color
Accurately, for more information.
On-screen preview of image appears different after
file is flattened.
When displaying an image at less than 100%
magnification, the on-screen preview is an
approximation of the actual pixels in the image.
To maximize Photoshop's performance, this
approximation may be made slightly differently
with layered files. In most cases, the differences are
not noticeable, but files with many adjustment
layers or extensive use of blending modes may look
different on-screen after flattening. When printed
or viewed at 100% or greater magnification, the
file will be unchanged. To view a file at 100%
magnification, choose View > Actual Pixels.
CMYK colors displayed in the Info palette are
different from those specified in RGB mode.
How colors are translated between CMYK and
RGB modes is determined by the parameters
specified in the Profile Setup, RGB Setup, and
CMYK Setup dialog boxes. Depending on the
settings of these parameters, CMYK values
specified in RGB mode may separate as different
values. (If the colors are specified in CMYK mode,
they will separate as specified.) See Chapter 4,
Choosing a Color Mode, and Chapter 5, Repro-
ducing Color Accurately, for detailed information
on color in Adobe Photoshop.
To determine the actual values that will result from
a separation in RGB mode, choose Window >
Show Colors to display the Colors palette. Be sure
to set the Colors palette to the CMYK mode. Use
the eyedropper tool to display the color in the
Colors palette. (The color values appear next to
the sliders.)
Painting tools don't work.
Painting tools work only on the target layer and
inside areas that are parts of the current selection
or when no part of the layer is selected.
Check to make sure that you are not painting
outside a selected area. Check to make sure
that you have not previously hidden the edges
of the selection by pressing Ctrl/Command+H,
or press Q to switch to QuickMask mode, to see
which pixels are selected. If you are painting
outside a selected area, choose Select > Deselect
to deselect everything or Select > Inverse to switch
the selected and unselected areas.