Konica Minolta AF-2840 instruction manual Tone curve and histogram corrections

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Tone curve and histogram corrections

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 repre- sents 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.

Output

Highlights

Midtones

Shadows

Input

Shadows

The histogram indicates the distribution of pixels with specific brightness and color values in the image. Using the histogram can maximize the output of the image data. Changes made with the histogram are also displayed on the tone curve.

Mid-tones

Highlights

Number of pixels

Luminance levels from 0 to 255

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Contents AV-A209 Color Examples Tone-curve correctionsSelective-color palette Before YOU Begin Table of Contents Page Table of Contents Page For Proper and Safe USE Page System Requirements Package contentsPolish IBM PC/AT compatible computersInstalling the utility software Windows InstallationBefore installing the utility software Page Installing the utility software Macintosh Page Macintosh Installing Adobe Photoshop ElementsLaunching the scanner utility from Photoshop Elements WindowsNames of parts Connecting the USB cable Before scanner setupTurning off the scanner Connecting the AC adapterDisconnecting the scanner Turning on the scannerHandling film Where is the emulsion?Film formats Loading the filmLoading mounted slides Loading a film holder into the scanner Using the FH-U1 and SH-U1 film holdersUsing the APS Adapter AD-10 sold separately Ejecting a film holder Easy Scan Utility Launching the Easy Scan UtilityUsing the Easy Scan Utility Canceling an index scan, prescan, or final scan Macintosh Page Pixel Polish button Auto Dust Brush button BMP File typesImage processing p Dimage Scan Dual III UtilityBasic scanning p Advanced scanning pDimage Scan Dual III Utility Basic Scanning Launching the DiMAGE Scan Dual III UtilityLaunching the utility from an image-processing application Selecting the film format and typeMain window and index scan tab Index scanSelecting index thumbnails Canceling the index scanMaking an index scan Flip and rotate images Fit-to-window button Main window and prescan tab PrescanAuto cropping Making a prescanGrab tool Magnifying toolPrescanning the cropped area CHP button APS filmManual cropping Auto Dust Brush Removing the effect of dust Main window and Pixel Polish tab Pixel Polish Correcting images automaticallyPage Making the final scan using Jobs Quitting the DiMAGE Scan Dual III Utility Dimage Scan Dual III Utility Advanced Scanning Setting scanner preferencesPage Exposure-control tab Loading exposure settings Saving exposure settingsReverse frame order More index scan functionsLoading an index file Saving the index imagesSaving an index file Autoexposure control More prescan functions AE lock AE area selectionPoint AF Autofocus Focusing the scanner More prescan functionsManual focus Scan setting window Inputting scan settings manuallyAbout resolution and output size Scan setting examples Deleting a Job Saving scan settings as a JobCustom Wizard Page Color matching Setting the output color spacePage Scanner color profiles Setting the monitor ICC profileOutput Color Space Monitor RGB Color matching recommendationsDimage Scan Dual III Utility Image Processing Image processing toolsMain window and image-correction tab Image processing glossary Guide to image processing toolTools and functions Effects Tracking image corrections Snapshot button Undoing and redoing image correctionsSaving image corrections Comparing pre and post correction imagesComplementary colors Loading image-correction JobsVariation palette Brightness, contrast, and color balance palette Tone curve and histogram corrections Tone curve and histogram palette Using tone curvesDrawing tone curves by freehand Bringing out detail in the shadows Short guide to tone curve correctionsCorrecting color Increasing image contrastHistogram corrections Tone curve / histogram auto setting White, gray, and black point corrections Selective-color palette Setting the white and black-point valuesUnsharp mask Hue, saturation, and lightness palette JOB File Lists 35mm filmAPS film Installed Files and Folders Mac OS Mac OS 8.6Solution Troubleshooting and Technical SupportPixel Polish and Mac OS Checking Scanner Installation WindowsTechnical support Warranty and product registrationRAM Technical SpecificationsAN Introduction to Color Primary RGB and secondary CMY colorsComplementary colors Hue corrections Complementary colors pHSB color model p Universal Copyright Convention AV-A209