This dialog tab allows you to modify several advanced parameters for ThumbsPlus.
Maximum image bitmap cache size. For images that require less than this much memory to load, ThumbsPlus maintains an image bitmap to speed up repainting when the image must be displayed. This size is based on the in-memory size of the image, not the disk size of the image file.
Bitmap window size for larger images. For images larger than the maximum bitmap cache size, ThumbsPlus uses a bitmap "window" to display the image a piece at a time. This parameter selects the size, in kilobytes, of that window.
Maximum memory for scale-to-gray and view resampling. If either "Scale bi-level images to gray" or "Resample images when reduced" is checked under Options | Viewing | Appearance, this setting is used to determine how much memory is allocated for the resample or scale-to-gray buffer.
Maximum file size to load for preview. This setting controls which images will be loaded for display in the preview tab when a thumbnail is selected. Images with file size larger than the specified number of kilobytes will not be loaded for preview.
Maximum local database buffer cache. For local (MS Access) databases, this number will affect how much physical RAM is used by the Access database engine (Jet). Setting it to low can starve the database engine and cause poor database retrieval speed. Setting it to high can cause overall system performance to degrade as well. The default setting for this option is zero. This disables the buffer size override and allows the Access database engine to calculate and set its own buffer size based on the amount of physical RAM installed on the system.
Maximum memory for image undo buffers. This setting controls how much memory ThumbsPlus will allow for multiple undo buffering for image operations in a view window. See: View Window - Edit | Undo for information on undo edit operations for images.
Thumbnail cache count. ThumbsPlus maintains a cache of thumbnails in memory. This field specifies the maximum number of thumbnails to cache. If you specify a larger count, the thumbnail view will display more quickly. The approximate amount of memory needed to cache a given number of thumbnails is shown below the count.
Note: Setting this field to 1 works around problems with some display adapters and drivers.
Copy metafiles to clipboard
Using actual size. Some applications do not handle proportional metafiles from the clipboard well. If you find metafiles pasted into other applications upside down or at really unusual sizes, select this option.
Proportionally. This option works for most applications. If metafiles are pasted very large when actual size is set, try proportional instead.
Yield frequency. The frequency (in milliseconds) that ThumbsPlus will yield to other desktop applications.
Watch folders frequency. If "Watch changes in folder" is checked under Options | Preferences - Thumbnail View, this setting will control the frequency (in milliseconds) that ThumbsPlus checks watched folders for any file changes.
Note: This option is the same as the Local folder frequency option in Tree | Watch Folders.
Use multi-threaded mode. Select this option to allow ThumbsPlus to run certain functions as background tasks instead of running them in the foreground. Background tasks do NOT display a modal progress dialog box and therefore do not stop you from continuing to use other ThumbsPlus functions.
Max. concurrent tasks. Enter the limit for the number of concurrently running tasks. When more than this number of background tasks are started, the later ones will queue up and wait for earlier ones to finish.
Background threads at normal priority. This option causes ThumbsPlus to execute background threads (tasks) at normal system priority. By default, background threads in ThumbsPlus are started at below normal priority so as not to steal CPU time from other applications.
Use Twain Native mode. Sets the TWAIN acquisition mode to native rather than memory.
Disable banded printing. Sends printed output to printer in a single device output, instead of breaking images into bands or sections before sending to the printer.
Bypass Internet proxy. Check this option to attempt to connect directly to a specified internet host when performing functions such as File | Online Photos | (Site) | Upload selected... and Help | Program Updates.
Show library warnings when loading files. Check this box to receive more detailed warning when ThumbsPlus encounters unusual files. The types for which this "warning" feature works are: TIFF, JPEG, CGM, PICT and WPG.