IrfanView IrfanView Inst Title
 

    

Image Menu

 
 

    
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Click on the Image Menu, or press ALT-I to access
these options. While the menu is open, click one
of the choices, or press the underlined letter
key to use that function.
 
Use the key or key-combination in parenthesis to
more quickly access the function without opening
the menu.
 

Information (I) Click on the Image menu, then select Information (or use the Information tool on the toolbar.) An information box opens, displaying the following about the image: Name, Compression (jpg, gif, etc.), Original size, Current size, Original colors (color depth), Current Colors (color depth), Disk size (bytes), Memory size (bytes), Current directory index, Loaded in (time to load image.) Click the OK button when you are done viewing the information.
Rotate Left (L) Click on the Image menu, then select Rotate Left. The entire image will be turned 90 degrees; the top of the image will move towards the left. Rotate Right (R) Click on the Image menu, then select Rotate Right. The entire image will be turned 90 degrees; the top of the image will move towards the right. Vertical Flip (V) Click on the Image menu, then select Vertical Flip. The entire image will be turned upside-down. Note that the left/right orientation will remain the same. Horizontal Flip (H) Click on the Image menu, then select Horizontal Flip. The entire image will be turned side-to-side, as in a mirror.
Resize Click on the Image menu, then select Resize. A dialog box opens, allowing you to choose the new size. There are several built-in choices, or you can type over the old numbers. The first number is the width, the second is the height, both in pixels. If you leave the Preserve aspect ratio box checked, only type in one number, the other will be calculated for you and the image will be resized with the same proportions as the original. Remember: if you have a small image and try to make it very large (or the reverse case,) you may lose some quality. For better results, try Resample. Click OK to resize the image. This action can be reversed by the Edit menu's Undo command. The Crop command, on the Edit menu, can also be useful in resizing. Resample (Ctrl + R) Click on the Image menu, then select Resample. A dialog box opens, allowing you to choose the resample filter to be used if you are enlarging the image. This is the same dialog box used for resize; the image can be resized directly with resample. Click OK to resample the image. This action can be reversed by the Edit menu's Undo command. Resampling an image often improves its quality, especially when enlarging it. Enlarging without resampling can often result in a blurry image.
Increase Color Depth Click on the Image menu, then select Increase Color Depth. A dialog box opens, showing the possible color depths; select one. Click OK to make the change. This action can be reversed by the Edit menu's Undo command. Decrease Color Depth Click on the Image menu, then select Decrease Color Depth. A dialog box opens, showing the possible color depths. Select one, or type in a custom number (2 to 256.) Click OK to make the change. This action can be reversed by the Edit menu's Undo command. Some images use more color depth than necessary. They can take up a lot of extra space. Decreasing the depth can reduce the size of the image file, often without affecting the quality of the image. Also, some older programs that use images can't handle the larger number of colors.
Convert to Greyscale Click on the Image menu, then select Convert to Greyscale. Greyscale (or Grayscale) is actually a color mode, like RGB. It contains more information about the photo than Black and White. Converting from color to greyscale will usually give a much better effect than from color to black and white. It also prints better. This action can be reversed by the Edit menu's Undo command. Negative Click on the Image menu, then select Negative. The image will be converted to a reversed-color version of the original. This action can be reversed by the Edit menu's Undo command. Brightness Click on the Image menu, then select Brightness. A dialog will appear with a slider control. Move the setting up or down, for more or less brightness. You'll see the image change as you move the control. When you are satisfied, click OK. To quit without changing the image, click Cancel. Together with the Contrast option, this can help correct an image that is far too light or dark. This action can be reversed by the Edit menu's Undo command. Contrast Click on the Image menu, then select Contrast. A dialog will appear with a slider control. Move the setting up or down, for more or less contrast. You'll see the image change as you move the control. When you are satisfied, click OK. To quit without changing the image, click Cancel. Together with the Brightness option, this can help correct an image that is far too light or dark. This action can be reversed by the Edit menu's Undo command. Color Balance Click on the Image menu, then select Color Balance. A dialog will appear with three slider controls, one each for Red, Green, and Blue. Move the settings up or down, for more or less of each color. You'll see the image change as you move the controls. When you are satisfied, click OK. To quit without changing the image, click Cancel. Sometimes an image with a lot of shadows can be corrected better with Color Balance, than with the Brightness / Contrast combination. This action can be reversed by the Edit menu's Undo command. Gamma Correction (Ctrl + G) Click on the Image menu, then select Gamma Correction. A dialog will appear with a slider control. Move the setting up or down, to adjust the intensity of the image. You'll see the image change as you move the control. When you are satisfied, click OK. To quit without changing the image, click Cancel. This action can be reversed by the Edit menu's Undo command.
Sharpen Click on the Image menu, then select Sharpen. The amount of sharpness can be set using the Effects Setup dialog. This action can be reversed by the Edit menu's Undo command. Effects See Effects page.
Swap Colors Click on the Image menu, then point the mouse at Swap Colors; a sub-menu appears. Select one of the color combinations and click on it. The image will change. This command operates at the pixel level, changing the color of all, or most, depending on which combination you select. For example: if you choose RGB -> RBG, the pixels that are green will be made blue, and the blue pixels will be made green. (In this combination the red pixels stay the same.) Edit Palette For images with 256 or fewer colors. Click on the Image menu, then select Edit Palette. A dialog will appear showing the colors at use in the image. Click on any color to display the information about it. Double click to bring up another dialog for editing the color. Your changes will appear in the image as you make them. When you are satisfied, click OK to close the dialog. This has much the effect of a paint program's fill tool, dumping a new color into a selected area. Here, though, the color will change wherever it is in the image. Dark gray highlights, for example can be made a lighter gray. This action can be reversed by the Edit menu's Undo command.
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Copyright 1999 by S.E. Clark.  All rights reserved.