Image Options - GQview User Manual

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# 10.2 Image Options

This section describes the options presented under the Image Tab of the options dialog.

Quality

Dithering method: Selects the pattern to use when dithering images on displays with a limited color pallet.

Zoom (scaling): Selects the method used to scale the size of an image.

Nearest: Fastest scaler, but results in poor image quality.
Tiles: Results are somewhat close to bilinear, with better speed.
Bilinear: High quality results, moderately fast.
Hyper: Slowest scaler, sometimes gives better results than bilinear.

Two pass zooming: Enables GQview to first display a scaled image using the nearest zoom quality. After image decoding is complete, the image is scaled again using the selected “Zoom (scaling)” method. This allows faster display of an image as it is decoded from the source file.

Zoom control

When new image is selected: This controls the behavior of the zoom setting when changing the displayed image.

Zoom to original size: The new image is set to it's original size.
Fit image to window: The new image's zoom is changed so that the image will fit within the current view area.
Leave zoom at previous setting: The zoom setting is unchanged, the new image will be scaled the same as the previous image.

Allow enlargement of image for zoom to fit: Enable this to allow GQview to increase the image size for images that are smaller than the current view area when the zoom is set to “Fit to Window”.

Offscreen cache size: GQview only renders the visible portion of an image. To reduce rendering the same area frequently when panning an image, some memory is used to retain the recently rendered image data. This value controls the maximum amount of memory to use.

Note: This setting controls the amount of memory for each image window.

Zoom increment: Adjusts the step size when zooming in or out on an image. This value corresponds to the percentage of the original image.

Miscellaneous

Progressive keyboard scrolling: This will cause image panning speed to gradually accelerate when holding down the keyboard arrows.

Mouse wheel scrolls image: The default is for the mouse wheel to change the image, and to scroll the image when shift is used in combination with the wheel. Enabling this swaps the behavior so that operating the wheel will scroll the image, and holding down shift will change the image.

Black background: Enable this to draw the image background (the area around the image) in black.

Refresh on file change: GQview will monitor currently active images and folders for changes in their modification time, and update the display if it changes.

Note: Disable this if the system will not go into sleep mode due to occasional disk activity from the time check, or if GQview updates too often for folders with continuously changing content.

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