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Konica Minolta IV instruction manual Short guide to tone curve corrections, About the tone curve

Models: IV

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A short guide to tone curve corrections

Image processing is a highly specialized and difficult field that takes years of practice to master. This basic guide to using tone curves covers a few simple procedures to improve your pictures. For more about digital-image processing, consult your local book dealer about self-help guides on this subject.

About the tone curve

	Highlights
Output	Mid-tones
	Shadows
	Input

The tone curve is a graphic representation of the brightness and color levels of the image. The bottom axis is the 256 levels of the original image (input data) from black to white. The vertical axis is the corrected image (output data) with the same scale from top to bottom.

The bottom left portion of the graph represents the dark colors and shadow areas of the image. The middle section represents the mid-tones: skin, grass, blue sky. The top right section is the highlights: clouds, lights. Changing the tone curve can affect the brightness, contrast, and color of the image.

Bring out detail in the shadows

This is a simple technique to make a subject hidden in the shadows brighter. Unlike the brightness level control (p. 40), this method of correction will not loose details in the highlight areas of the image.

With the RGB channel selected, place the smooth- curve cursor on the center of the curve. Click and drag the curve up. Look at the displayed image to judge the result. The adjustment can be very small and still have a significant impact on the image. Moving the tone curve down will make the image darker.

62 ADVANCED IMAGE PROCESSING

Image 62

Konica Minolta IV instruction manual Short guide to tone curve corrections, About the tone curve

Contents

Page Tone-curve corrections Selective-color paletteBefore YOU Begin For Proper and Safe USE DiMAGE Scan Dual Table of Contents Page Table of Contents Names of Parts InstallationBefore installing the DiMAGE Scan Utility DiMAGE Scan system requirements Additional memory requirements Adobe Photoshop ElementsWindows Page Macintosh Page Connecting the USB cable Scanner SetupBefore connecting the scanner to a computer Turning on the scanner Connecting the AC adapterDisconnecting the scanner Handling film Where is the emulsion?Loading the Film Holders Loading 35mm film stripsLoading mounted slides Loading a film holder into the scannerUsing the APS Adapter AD-10 sold separately Ejecting a film holder APSDimage Scan Launcher Easy Scan Utility Launching the Easy Scan UtilityUsing the Easy Scan Utility Scanner Notes MacintoshOn next Easy Scan Utility Page Scanning basics Basic ScanningLaunching the DiMAGE Scan Utility Scanner setup Main window and index scan tabMaking an index scan Selecting index thumbnailsFlip and rotate images Fit-to-window buttonMain window and prescan tab Making a prescanAuto cropping Grab toolMagnifying tool CHP button APS filmMaking the final scan Tiff BMP Pict Basic Image Processing Main window and image-correction tabPixel Polish Auto Dust Brush Auto Dust Brush retouching levelVariation palette Brightness, contrast, and color balance palette An introduction to color GreenComparing pre and post-correction images Undoing and redoing image correctionsQuitting the DiMAGE Scan Utility Setting scanner preferences Advanced ScanningPage Exposure-control tab Saving exposure settings Loading exposure settingsMore index scan functions Reverse frame orderLoading an index file Saving the index thumbnailsSaving an index file More prescan functions Point AF AutofocusManual focus Manual cropping Autoexposure AE area selectionInputting scan settings manually About resolution and output size Scan setting examples Saving scan settings as a Job Deleting a JobAdvanced Image Processing More image-processing toolsDigital Grain Dissolver Prescan display Sample display areaUsing tone curves Tone curve and histogram paletteDrawing tone curves by freehand Short guide to tone curve corrections About the tone curveIncreasing image contrast Histogram corrections Tone curve / histogram auto setting Short guide to histogram corrections Konica Minolta HistoryPage White, gray, and black point corrections Setting the white and black-point values Tracking image corrections Snapshot buttonHue, saturation, and lightness palette About RGB and CMY Unsharp mask With mask Original imageSaving image corrections Loading image-correction JobsCustom Wizard Page Batch Scan Utility Page Advanced Batch Scan setup Page Setting the output color space Color MatchingOutput color spaces Ntsc CIE RGBSetting the monitor ICC profile Scanner color profilesColor matching recommendations Output Color Space Monitor RGBAuto Dust Brush PLUG-IN Before installing the plug-inInstallation Windows Page Installation Macintosh Using the Auto Dust Brush plug-in Auto Dust Brush PLUG-IN Appendix Glossary of common termsUninstalling the DiMAGE Scan Software Installed files and folders WindowsJob file list 35mm Troubleshooting Checking software installation Windows Technical Specifications Record keeping Warranty and product registrationTechnical support Image Data Sheet Image processingHue corrections