Click and drag the Green caret (pointer) under the histogram image. You can now make the same adjustments described above.Īdjustments can also be made by adjusting the position of the pointers along the bottom of the histogram. Hold down the shift key, then press and hold the left mouse button down. Simply point the mouse at any image window. This function is also available without using the Screen Stretch window. Move the mouse right to increase contrast Move the mouse downwards to decrease brightness Move the mouse upwards to increase brightness You can now adjust the image contrast and brightness as follows: The mouse cursor changes to a "four arrows" shape. Point the mouse at the Quick Stretch box and press and hold the left mouse button down. The Quick Stretch control is the shaded box at the upper right of the Screen Stretch dialog box. This method gives instant updates as the mouse is dragged, and is particularly fast for monochrome images. The fastest way to adjust the image brightness and contrast is to use the Quick Stretch control. Note that selecting the stretch mode has no effect on how the image is stored it only changes how it is displayed. Each of the three views reveals different parts of the comet. Try selecting the High Stretch setting and see what happens. The Low Stretch setting makes the image darker, allowing details in the brighter part of the comet to be visible. Similarly, the green caret indicates the brightness level that is displayed as white on the screen this brightness level is indicated in Maximum.Ĭlick on the drop-down list with the mouse and select Low. The brightness level of the red caret is indicated in Minimum. The red caret (pointer) indicates the brightness level that is displayed as black on the screen. The graph shows that most of the pixels are grouped on the left (dark) side of the histogram, and that the number of pixels drops off rapidly at brighter levels (right side). The large histogram graph at upper left shows the relative number of pixels (vertical scale) at each intensity level (horizontal scale) in the image. The Screen Stretch window should look something like this: If it is not, click the Toggle Screen Stretch button on the Toolbar. Make sure the Screen Stretch window is visible. (For help on opening files see the Open a File Tutorial). If you have not already done so, open the DG_HaleBopp.fits file in the Samples directory. On an HP Spectre 13t laptop, you can use the F2 and F3 keys to lower or increase the screen brightness.Adjust Brightness and Contrast Tutorial Adjust Brightness and Contrast Tutorial On some keyboards, there are keys specially designed to help you modify the screen brightness with ease. How to adjust the brightness in Windows 10 using keyboard shortcuts Check your Windows 10 build and, if necessary, get the latest Windows 10 update available for you. If you're using an older version of Windows 10, you might not have access to all the features. NOTE: The features presented are available in Windows 10 November 2019 Update or newer.
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