Better Light 7 manual Color Balance Sensitivity, Tone Curves, Lens Aperture

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Increasing the line time is the “cleanest” method of increasing exposure. Doubling the line time yields one EV (f-stop) of increased sensitivity, but only increases the background noise level by 1.4 times.

Color Balance (Sensitivity)

Controls the relative sensitivity of each color channel; continuously adjustable in 0.1 CC (1/10 color correction unit) increments. Higher color balance numbers provide increased sensitivity to light, but also increase shadow noise. Use the color balance editor (the Color tab panel in the main control window) to examine and/or change the Neutral numbers for the selected color setting (the popup menu at the bottom of the Color tab panel).

Adding 30.0 CC to each color channel’s Neutral number yields one EV (f-stop) of increased sensitivity, and increases the background noise by 2.0 times.

Changing all three Neutral numbers by the same amount (e.g. 30.0 CC) will not affect the color balance of the camera. No Neutral value can go above 130 CC or below 0.0 units. If any Neutral value approaches130 or 0, the ISO value will stop changing.

Tone Curves

Controls the translation of “raw” digital data values into finished output data values. For “expo- sure” purposes, a given Tone Curve can often be shifted horizontally to increase or decrease the effec- tive sensitivity of the system. Use the Brightness buttons (in the Tone tab panel) to quickly shift the entire curve in the desired direction. The Decrease Brightness button moves the curve to the right, requiring more exposure (light or time), and Increase Brightness button moves the curve to the left, requiring less exposure.

Each click of a button moves the curve about 0.2 EV. Moving the curve 1 EV to the left decreases the required exposure by 1 f-stop (lightens the image), and increases image noise by 2.0 times.

Lens Aperture

While the lens aperture is not a digital camera adjustment, it can significantly affect exposure and scan times. Aperture is usually adjusted for the desired depth of field, often at the expense of expo- sure. It may be possible to scan significantly faster by using camera movements to maximize usable depth of field and then opening the lens somewhat to allow more light into the camera. Opening the lens 1 f-stop decreases the required exposure by 1 f-stop, which should indirectly reduce background noise (depth of field is also affected).

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Contents Large Format Digital Scanning Camera System Revision D MarchAcknowledgements Page Page Contents Lock Crop Ratio Locking BothSaving a High Bit Depth Image Audio Focusing Aid Multiple Color FocusingAltering Color Balance for Mood or Effect Limit LineExporting Notes Automatically Opening the ImageLighting Hardware Setup Software OperationLine Time Parts List Connector Identification Installing and Configuring the ViewFinder Software Getting StartedMacintosh Memory RequirementsSystem Requirements PC PC version of the software is requiredConnect the control unit to the host computer Quick Start GuideConnect the camera insert to the control unit Mate the female end of the cable with the DBTurn on the digital camera Connect the AC power to the control unitInstall the viewing overlay on the camera’s ground glass Turn on the host computerInstall the infrared blocking filter Mm thick Tungsten infrared blocking filterPut the insert into the camera Select the image capture settingsCompose and focus the image Start the ViewFinder softwareTransfer the file to the computer PrescanTake the picture View the final imagePrescanning Making a PrescanFast Prescans Cropped Prescans Super View Prescans Color Managed Prescans Canceling a PrescanSaving and Viewing Prescans Rulers GuidesImage Capture Settings ResolutionPage Line Time ISO Capture Mode Exposure LockScanning to the Camera Disk Canceling a ScanScanning Naming the Image Automatically Naming ImagesAdding Notes to Your Picture RGB Data Values, EV Units Exposure EvaluationDigital Spot Metering Determining Relative Exposure Static Spot Meter Tool Setting the Spot Meter Size Histogram Judging Overall and Spot ExposuresStatic Spot Meter Location Readings Hand Tool Tool BarMagnify Tool Measure Tool Mac only Panorama ToolToneZones Tool Page Crop Mask Tool Grid ToolPage Scan Area & Cropping Tab PanelsSize Panel Size of the cropped area may still be adjusted while Different unit. Example 15.24 cm x 10.16 cm at 300 pixels perLock Crop Ratio To set a specific shape for crop rectangle Clicking up or down buttons of Scan AreaLock File Size To specify an exact file size Faster Scans for Free Seconds Scan directionColor Panel Establishing Neutral Color BalanceSaving Color Balances Altering Color Balance for Mood or Effect Changing Existing Color BalancesDeleting Color Balances Reverting to a Previous Color Balance Tagging Images with ICC ProfilesTone Panel Tone Curve SelectionsSaving a High Bit Depth Image Brightness/Contrast Tone Curve Adjustments Manual Tone Curve Adjustments Negative Curves Limit LineSpot Meter Reference Points Bit Tone CurvesSelecting an Output Tone Scale Setting the EV Scale ReferenceTone Curve Histogram Saving Tone Curves Deleting Tone CurvesFocus Panel Large Focus DisplaySelecting a Focus Site Reading the Focus Displays and Adjusting Focus Audio Focusing Aid Mac only Multiple Color FocusingInfrared Focus Image File Management and Retrieval ViewFinder File Manager Exporting Notes Sorting Image FilesAdding more Notes to Your Pictures Automatically Saving Files to a Folder Automatically Opening the ImageRetrieving Image Files Selecting the Retrieval Tone Curve USB controller only Deleting Image Files Hard Drive Storage CapacityMenus File MenuEdit Menu Display Menu Camera Menu Diagnostics Capture ModeClean/Park Opens the Clean/Park window to expose the CCD for cleaningAfter highlighting the desired folder, click User PreferencesAutomatically Retrieving Images Saving Files Right of the Save scan folder labelAutomatic Scan Viewing in an Application Auto File Open Automatically Save PrescansAuto Naming Auto-rotate Retrieved Files MaskGrid GuidesISO Increment Selection Using SoundsBaseline ISO Setting Time Lapse Pano SettingsUse this feature, the factory settings are adequate CropCleaning the CCD Cover Glass Appendix aManipulating Exposure Exposure AdjustmentsAppendix B Line TimeLens Aperture Color Balance SensitivityTone Curves Lighting Line Time Settings Appendix CModel 4000E-HS Resolution SelectionsAppendix D Model 6000-HS, 6000E-HSSuper 6K-HS Super 8K-HS Appendix E Status IndicatorsPower StatusPanoramic Adapter Hardware SetupAppendix F Scene PanoramaPage Rollout Panorama Object Panorama Hardware is assembled just as it is for a Rollout panoramaCamera reported error No Room Error MessagesCamera reported error Not Ready Camera reported error Conversion ErrorScsi Errors Comm returned error Camera reported error Value ErrorCamera reported error Math Error Other Errors Unknown ErrorCamera Timed Out
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