Short guide to tone curve corrections | Konica Minolta IV specification

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

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

Contents

Page Tone-curve corrections Selective-color palette Before 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 Elements Windows 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 strips Loading mounted slides Loading a film holder into the scanner Using the APS Adapter AD-10 sold separately Ejecting a film holder APS Dimage Scan Launcher Easy Scan Utility Launching the Easy Scan Utility Using the Easy Scan Utility Scanner Notes Macintosh On next Easy Scan Utility Page Scanning basics Basic ScanningLaunching the DiMAGE Scan Utility Scanner setup Main window and index scan tab Making an index scan Selecting index thumbnails Flip and rotate images Fit-to-window button Main window and prescan tab Making a prescan Auto cropping Grab toolMagnifying tool CHP button APS film Making the final scan Tiff BMP Pict Basic Image Processing Main window and image-correction tab Pixel Polish Auto Dust Brush Auto Dust Brush retouching level Variation palette Brightness, contrast, and color balance palette An introduction to color Green Comparing pre and post-correction images Undoing and redoing image corrections Quitting the DiMAGE Scan Utility Setting scanner preferences Advanced ScanningPage Exposure-control tab Saving exposure settings Loading exposure settings More index scan functions Reverse frame order Loading an index file Saving the index thumbnailsSaving an index file More prescan functions Point AF Autofocus Manual focus Manual cropping Autoexposure AE area selection Inputting scan settings manually About resolution and output size Scan setting examples Saving scan settings as a Job Deleting a Job Advanced Image Processing More image-processing tools Digital Grain Dissolver Prescan display Sample display area Using tone curves Tone curve and histogram palette Drawing tone curves by freehand Short guide to tone curve corrections About the tone curve Increasing 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 button Hue, saturation, and lightness palette About RGB and CMY Unsharp mask With mask Original image Saving image corrections Loading image-correction Jobs Custom Wizard Page Batch Scan Utility Page Advanced Batch Scan setup Page Setting the output color space Color Matching Output color spaces Ntsc CIE RGB Setting the monitor ICC profile Scanner color profiles Color matching recommendations Output Color Space Monitor RGB Auto 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 terms Uninstalling the DiMAGE Scan Software Installed files and folders Windows Job file list 35mm Troubleshooting Checking software installation Windows Technical Specifications Record keeping Warranty and product registrationTechnical support Image Data Sheet Image processing Hue corrections