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To resize the image dimension you can either press [Shift]+[S] or select the "Resize Image" option from the Recipe Panel's <Editing> drop down and then "Size & Crop"
The resize dialog will open. IDimager allows a so called “Proportional resize”. This resize method enables you to specify a size value for the longest side of the image only and the shortest size will be calculated by the application based on the image width and height ratio. Proportional resizing is very convenient when you need to resize landscape and portrait images combined. If you deselect the “Proportional resize” option you will be able to set a custom width and height value.
Optionally enter the resolution for the resulting images and select the units (pixels/inch or pixels/cm).
Now enter the size. The size can be specified in pixels or in inches/CMs. Those last two sizes will be calculated based on the resolution specified.
Use the Interpolation option to recalculate the pixels for downsizing or up sizing. Depending on the image’s content you may need to play with the different interpolation filters to see which filter works best for a particular image. As fist rule you can use Lanczos3 for downsizing or B-Spline for up sizing. Using an interpolation filter is optional and will slightly slow down the resize process. However interpolation generally improves the quality of the sizing output.
The option “Enlarge images that are smaller” can be set to upscale images that are smaller than the size required for the resize. If de selected, than smaller images will keep their original size.