Minolta DiMAGE Viewer instruction manual

Page 57

The highlight level, shadow level, and gamma can be set manually. The histogram can be used to maximize the distribution of the pixels in the image. All the levels on the histogram are displayed numerically to the right of the sliders. These numbers can be changed with the keyboard.

The gamma slider defines the mid-tones of the image. Dragging the gamma slider to the right will darken the image, and dragging it to the left will brighten it. Similar to the tone-curve correction described on page 50, the gamma slider allows the brightness of the image to be adjusted without loosing image information.

The input highlight slider sets the white level. As the slider is moved to the left, an apparent increase in contrast can be seen in the displayed image. All pixels to the right of the slider are set to 255 and any image detail they may contain will be lost. This can be an important tool for improving copy images of text on a white background. Uneven illumination, or faded or stained paper can be distract- ing when copying text or line art. By adjusting the white level, the imperfections of the white back- ground can be eliminated leaving only the darker text visible.

The input shadow slider sets the black level. As the slider is moved to the right, an apparent increase in contrast can be seen in the displayed image. All pixels to the left of the slider are set to 0 and any image detail they may contain will be lost.

The black and white output levels can be adjusted. By moving the output highlight and shadow slid- ers, the contrast of the image can be reduced.

For examples of histogram corrections, see the following section.

57

Image 57
Contents SY-A306/ME-0306 Page Before YOU Begin Table of Contents Advanced image processing Dimage Viewer System Requirements Quicktime System Requirements Before Installing the Dimage ViewerInstalling the Dimage Viewer Windows Page Installing the Dimage Viewer Macintosh Page Starting UP the Viewer Windows Starting UP the Viewer Macintosh Updating the Thumbnail Window Loading Image FilesVoice memo / Audio caption Audio recording Opening Audio FilesChanging the Display Format Changing the Thumbnail Format Selecting Thumbnails Sorting Image FilesRenaming Multiple Files Renaming Single FilesCreating Folders Moving Images to Another Folder Copying Images to Another Folder CUT, COPY, PASTE, and Delete Macintosh CUT, COPY, PASTE, and Delete WindowsDisplaying and Saving Image Information Editing the Subject Line Image Information SetupIMAGE-CORRECTION Window Tool bars Displaying Images in the IMAGE-CORRECTION Window Flip and Rotate Images Controlling the Image Display Fit-to-window buttonResizing the viewer window Grab tool Magnifying toolMenu options Variation Palette Page BRIGHTNESS, CONTRAST, and COLOR-BALANCE Palette RED Magenta Yellow Blue Green AN Introduction to ColorComparing PRE and Post Correction Images Processing Images Text and Line ART Undoing and Redoing AN Image CorrectionBasic Image Processing Data ImprintingLuminance Saving AN Image Resizing AN Image to be SavedChanging the Image Name or Format Printing Printer setup Creating AN Index Sheet Page Advanced Image Processing TONE-CURVE / Histogram Palette Using the Tone Curve Drawing Tone Curves by Freehand Bring out detail in the shadows Short Guide to TONE-CURVE CorrectionsCorrecting color Increasing contrastWHITE, BLACK, and GRAY-POINT Corrections Page Setting the White and BLACK-POINT Values Displaying the Color Histograms TONE-CURVE / Histogram Auto SET TingHistogram Corrections Page Short Guide to Histogram Corrections Page HUE, SATURATION, and Lightness Palette HUE Correction Example Auto-setting buttonSharpness Low-frequency setting Area Marquee Saving or Printing a Portion of AN Image Tracking Image Corrections Snapshot Button Saving Image Corrections Loading IMAGE-CORRECTION Jobs Processing RAW Images Page Saving RAW Images Loading RAW Jobs Saving RAW JobsBatch Processing Page Movie Enhancer Flicker Correction Splicing two movie clips Editing Movie FilesCopying sections from one movie to another Correcting Movie Images Page Customizing the Viewer Preferences Advanced SetupPage Color Matching Color Preferences Page Using Printer ICC Profiles About Dimage Viewer ICC Profiles Using Monitor ICC ProfilesWinnt ICC Profile LocationsUninstalling the Dimage Viewer WindowsMacintosh Copying JOB Files Macintosh OS Embedded Camera Color Profiles Page 1AG6P1P1616