Reshade

Reshade is a very powerful tool that can enlarge an image without losing its quality properties. It can be used by both beginners and expert users.

The user interface is simple, yet organized, divided into three sections - Main / Advanced Options and Batch Processing.

Once you have opened an image file (the drag and drop method is not supported, not in Windows 7 at least), there will be two copies of it displayed - the original and the altered picture.

First of all, you can customize image dimensions (width, height, resolution), or select screen resolution (from 100x100 pixels to 6000x3750 pixels).

In order to perform changes, you can adjust levels for noise and artifacts reduction, texture, accuracy and control (or Reshade can automatically adjust it). You can just as well use a cropping tool (and optionally constrain proportions).

In the 'Advanced Options' area, you can set compression quality, as well as adjust fidelity processing (optionally enable 'Best Edges') and smooth gradients, while 'Batch Processing' allows you to resize several images after applying the current settings for all of them.

We have encountered some small issues with the program. There is no 'Undo' button; you can only restore all settings to default. Reshade takes a few seconds to apply a modification, temporarily reverts the output image's quality to default settings when you click any area of the two images, and displays watermarks on the output pictures (in the trial version).

On the other hand, the software uses a moderate amount of system resources and comes with a professionally designed help file with snapshots (but which is easily understood). It is also easy to use and the effects applied on the altered, enlarged image are remarkable.