Canon 800II manual Preparing Gamma Curve Data

Page 32

Chapter 2 Specifying the Scanner Settings

Preparing Gamma Curve Data

Gamma curve data consists of a 258-line text file (*.gmm) containing the output values for the 256 levels of input values.

Always enter a connect as the first line of the gamma curve data and “256” in the second line to indicate the number of data items.

Lines 3 onwards set the output values for each input value, starting with the output values for “0” in line 3, “1” in line 4 and so on through to the output value for input value “255” in line 258.

Smaller values in the gamma curve data give a darker image while larger values produce a lighter image.

Example of Prepared Gamma Curve Data

Normally, the gamma curve leans to the right. However, the leftward-leaning gamma curve shown in the lower figure below inverts all the output values so that the result- ing image is also inverted.

Gamma curve data

 

1st line

: gamma curve

255

2nd line

: 256

 

3rd line

: 0

 

4th line

: 1

 

5th line

: 2

Output value

 

 

 

 

 

 

 

 

 

253rd line : 250

 

254th line : 251

 

255th line : 252

 

256th line : 253

0

257th line : 254

 

258th line : 255

 

Gamma curve data (inverted)

 

 

1st line

: inverted linear gamma curve

 

2nd line

: 256

255

 

3rd line

: 255

 

 

4th line

: 254

 

 

5th line

: 253

 

 

 

 

Output value

 

253rd line : 5

 

 

254th line : 4

 

 

255th line : 3

 

 

256th line : 2

 

 

257th line : 1

0

 

258th line : 0

 

(Gamma curve)

255

Input value

(Gamma curve)

255

Input value

32

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Contents Introduction Conventions ScannerContents Troubleshooting Chapter Installing Scanning Utility Before InstallationInstalling Scanning Utility Login to WindowsSelect English United States and click OK Open field, type D\su800\setup.exe and click OKClick Start and select Run Click Next Check the displayed installation folder and then click NextInstallation ends and the Setup Complete dialog box appears Uninstalling Scanning Utility Scanning Utility 800 screen, select File-Exit Basic Scanning Utility 800 OperationsStartup and Exit Save Page As Screen DescriptionsOpen Printer setting Scanner settingCancel Scan Converter modeToolbar Status barZoom Zoom OutAbout NextPrev Installation and Basic Operation of Scanning Utility Installation and Basic Operation of Scanning Utility Specifying the Scanner Settings Click the Start button and select Programs-Scanning Utility Specifying the Scanner SettingsStarting up Scanning Utility Select File-Scanner setting..., or click on the Toolbar Scanner Settings Size Frame AreaCenter LeftCancel BrightnessContrast ButtonsDetail Settings AE Adjustment Image RotationDetect Image Size Add onFilter Settings DefaultErase Background Erase NotchCounter Add on SettingsText Time For 4.28.30 pmDate For January 20Horizontal Offset mm Vertical Offset mmPages Addon TypeCounter Settings Reset TriggerIncrement Trigger New FileReset Value Gamma Curve Settings Click Download and select the prepared gamma curve dataPreparing Gamma Curve Data Assign the function Assigning Function KeysSelect a function key Adjust Margin Adjust SharpnessPicture Mode Setting AssignmentUsing the Scanner Scanning and Saving Images ScanProject the image on the scanner screen Select File-Scan Check the scanned imageSelect File-Save Page As... or click in the Toolbar Print the scanned image. P.46 Printing the Displayed ImageFile Types File NamesScan Batch to File Number of file name charactersClick Start Scanning Scanning ends Check the scanned imagesSelect a file and click OK Opening a Saved FileSelect File-Open or click in the Toolbar Check the scanned image Printing Images Scan Batch to PrinterActual size Fit to paperSelect File-Scan batch to printer Check the scanned images Printing the Displayed Image Select File-Print or click on the ToolbarCheck the print settings and click OK Creating New Folders Converter ModeOther Operations Use the FS Controller III keyboard to perform the scan File names for image filesReaderPrinter Emulation Mode Check the printer paperPrinting ends Using the Scanner Troubleshooting When an Error Message is Displayed Sion Message File already exists. Do you wish to overwrite it?Message When the Scanned Image is Not Normal Scanner settings are incorrectScanner’s scanning plate or lense are soiled Scanning Utility 800 does not run correctlyIndex BMP When the Scanned Image is Not Normal Troubleshooting

800II specifications

The Canon 800 II is a remarkable addition to Canon's lineup of high-performance telephoto lenses, specifically designed for professional photographers and wildlife enthusiasts. Its impressive features, advanced technologies, and robust characteristics make it a popular choice for capturing exceptional images even in challenging conditions.

At the core of the Canon 800 II is its focal length of 800mm, which allows photographers to achieve stunning close-ups from considerable distances. This is particularly beneficial for wildlife and sports photography, where getting close to the subject may not be feasible. The lens has a fast f/5.6 aperture, enabling excellent performance in low-light environments while maintaining a shallow depth of field for beautifully blurred backgrounds.

One of the standout features of the Canon 800 II is its lightweight design made possible by the incorporation of advanced materials such as magnesium alloy and fluorite elements. Weighing significantly less than its predecessor, the lens is easier to handle during long shooting sessions and provides superb portability for photographers on the move.

Image stabilization technology is another impressive aspect of the Canon 800 II. With a sophisticated image stabilization system, photographers can achieve steady shots even at slower shutter speeds, reducing the potential for camera shake. This feature is particularly useful when shooting handheld or in challenging lighting conditions.

The lens also incorporates Canon’s Super Spectra Coating, which helps to minimize ghosting and flare while enhancing contrast and color accuracy. This ensures that images are sharp and vibrant, making it easier to capture the intricate details of distant subjects.

Autofocus on the Canon 800 II is powered by a ring-type ultrasonic motor (USM), allowing for fast and silent focusing. This is essential for capturing fleeting moments in wildlife photography, where speed and accuracy are crucial. Additionally, the lens features full-time manual focus, providing photographers with the ability to fine-tune their focus without having to switch modes.

Durability is key for professional-grade lenses, and the Canon 800 II is designed to withstand tough environmental conditions. With a weather-sealed construction, it offers protection against moisture and dust, allowing photographers to work confidently in various climates.

Overall, the Canon 800 II stands out for its exceptional performance, lightweight design, advanced image stabilization, and robust build quality. Whether photographing wildlife, sports, or scenic landscapes, this lens offers unrivaled capabilities that help professionals capture stunning images with ease and precision.