View Window - Transform | Resize...                    R

Main Window - Image | Batch Process - Batch Steps - Add | Transform | Resize...



Use this dialog box to resize an image.


Original size. Shows the current size (width x height) in pixels of the image.


New Size. Various options for the new size of the image, include specific percentages and specific sizes. You can also select Current Window to size the image to the current window size, or Custom to enter specific values.


Resolution. Shows the current resolution settings. Click the [Set] button to select the resolution settings. See: Edit | Set Resolution for more information on image resolution settings.


Width & Height. When New Size is set to Custom, these values may be entered either as exact pixel measurements, or as percentages of the original.


Printed size. Enter the desired width and height in inches (or millimeters) and ThumbsPlus will automatically compute the new size based on the Resolution settings above. These fields will be disabled if the resolution has not been specified for the image.


Aspect Fit. This selection sets how ThumbsPlus treats an original whose dimensions are of a different ratio than the destination. In other words, it controls the size of the destination file.



The final image fits in the specified rectangle as closely as possible.


The final image will be the same width as the specified width.


The final image must be the same height as the specified height.


The aspect ratio of the original is ignored.


Background color. If Aspect Fit is set to Both, when resizing to a size that does not match the original aspect ratio, a background is added. Here you may select the color of that background.


Interpolation. Use this drop-down list to select the type of interpolation (resampling) which ThumbsPlus will do when resizing:


Nearest neighbor (fast)

This is the fastest resize method, but the least pleasing because it performs no pixel interpolation. Usually results in significant "jaggies".

Bi-linear (good)

Computes weighted average of four pixels, based on computed position from the original source. This is slower but better than Nearest Neighbor, and considerably faster than bi-cubic.

Resample (better)

Use resample to properly interpolate colors when making an image smaller.

Bi-cubic (better)

Computes cubic convolution of sixteen pixels, based on computed position from the original source. This produces the most accurate results, but is significantly slower than bi-linear interpolation.

Best fit for sizing

Automatically selects Bi-cubic when making an image larger and Resample when making it smaller.


Autocrop after resizing. Select this option to have the image automatically cropped after the rotate/resize operations. See: View Window - Transform | Autocrop.


Reduce only. (Only in batch processing). Select this option to resize only those images that are larger than the specified size.


ThumbsPlus remembers the last settings from this dialog box so that you can re-use them for additional images, or for batch processing.


Note: If you rotate or resize a 256 (or fewer) color image and select interpolation, ThumbsPlus will automatically promote it to 24-bit (truecolor) to be able to interpolate intervening pixels. You can then use the Image | Color Depth selection from the view window menu to adjust the colors to the number you desire. Likewise, ThumbsPlus will promote any grayscale image less that 256 levels to an 8-bit grayscale image.