Hi, can you help me to create button to resize selected image file to 100x100 (same folder as selected one), and rename resized image to "coverart". in one clic button of course 
Via the built-in image converter:
Image CONVERT=jpg HERE AS coverart.jpg HEIGHT=100 WIDTH=100 PRESERVEASPECTRATIOVia ImageMagick:
runmode hide
convert.exe -resize 100x100 {filepath$} coverart.jpg
ImageMagick's resize algorithm produces slightly different results to that of Opus, for very small images like this. Most of the time it isn't noticeable but with some high frequency stuff (e.g. the microphone grille in the examples below) IM tends to produce a smoother image while Opus produces a sharper image. Which you prefer is a matter of taste.
Since IM is free and integrates with Opus I thought I'd mention it as well. Of course, if both the images below look good to you, or you prefer the sharper output of Opus, then using the built-in converter is much more convenient and will give you a nice progress dialog and better error handling.
Here's the image where I saw the biggest difference between IM and Opus. First is Opus, second is IM:
many thanks nudel