All posts by markus

nomacs 3

nomacs 3.0 is out. In the past months we updated all nomacs dependencies and build systems. Along with these changes, nomacs ships with a new installer on Windows. In addition to these changes, we worked on these features:

  • New online installer  – Windowsnomacs-icon3
  • Plugins are now available on Linux
  • Full SVG support
  • Quick Launch added
  • Tiny planet option added
  • Batch processing improved
  • Signed executable – Windows only
  • Libraries updated – Qt 5.5, OpenCV 3
  • Command line arguments added
  • Zoom control improved
  • nomacs learned two new languages – Bulgarian and Ukrainian
  • new plugin: Page Extraction – detects and/or crops document pages

Like other Open Source software, we moved our download pages away from SourceForge. These are the new locations:

— the nomacs team

Support nomacs

nomacs 3 will be released with a brand new & shiny installer. Therefore and for other reasons we will leave sourceforge. To guarantee fast downloads, we will rent a webspace which costs around 50€ (~56.085$).
Now we face two options:

  1. Google AdSense which adds ads to this webpage resulting in an ugly page
  2. You donate

If you donate 50€ until the end of 2015, this page keeps its simple white UI and no ads are added until the end of 2016. There are three ways how to keep an ad-free interface:

  1. a rich contributor donates 50€
  2. every 100th download 2€ are donated
  3. every 100th visitor donates 50 cents

be part of it:

thank you
— the nomacs team

[UPDATE]: we have reached our goal of 50€ – thanks to all donators! As promised, will remain free from ads and nomacs 3.0 will be hosted on a new server which drastically improves the update process.

Of course we will still appreciate any donations (we are far from being a big corp : )

nomacs 2.4.4

this version is mainly a response to all your suggestions and bug reports – thank you for supporting us in increasing nomacs’ performance and usability. New features include:

  • Improved batch processing (you can now add images from multiple folders)
  • New Metadata HUD panel (you can dynamically choose entries)
  • nomacs respects your default proxy settings (e.g. when [manually] updating)
  • The portable version ships with a qss file (so you can customize almost everything)

the most important fixes are:

  • Default strings are now translated
  • Linux file sorting is (hopefully) fixed by now
  • Gamma correction for rescaling is now 16 bit (smooth gradients)
  • Zoom to Fit added (replaces ‘Reset Zoom’)
  • Saving of multiple tabs
  • UTF-8 encoding for image notes
  • General stability improvements

[EDIT] thanks to R3gi we have noticed that nomacs 2.4.4 has slow loading times on Windows 7. That is why we updated only these versions to nomacs 2.4.5. Sorry for any inconveniences caused!

— the nomacs team

Batch Processing

nomacs supports batch processing since version 2.4. You can open the bach processing from the Menu > Tools > Batch Processing. Currently there are four different processing modes (Copy/Rename | Image Format Conversion | Image Resize | Transforming).

First you can choose the directory and select the files you want to process. File selection is similar to the thumbnail preview (select multiple files using CTRL, hold SHIFT to select files consecutively or hit CTRL+A to select all files of a folder). You can additionally filter a subset using search terms or regular expressions (in the example below all files are chosen which start with a lower case character). After selecting the files to be processed you can click the Icon Add Files to the File List. If you open the File List Tab, you can also drop multiple folders to select their files for processing. Having selected the files to be processed, you can choose an output directory. The output panel allows you to choose the old filename or rename all processed files. The screenshot shows a file conversion where 87 files are converted to png.


The Output panel allows you to choose an output directory and rename/convert files. You can choose a custom filename. Do not forget to add a sequence number such that the filenames are still unique. The filename preview picks a selected image and shows the old and the new filename accordingly. If input and output directory are the same, images will be renamed in place. Otherwise the images are copied and renamed. This action will not change the image encoding.

the output panel
the output panel

Image Conversion

If you want to convert images to a specific output format (e.g. PNG) you can change the Keep Extension drop down to Convert To. Then select your preferred format. You can choose any format which is supported by nomacs.

batch convert images
batch convert images


Click the + next to Resize/Transform to apply an image transform. If you e.g. want to downsample all images of a folder, you can choose Long Side in the resize panel. Then enter the desired side length in pixel. This option will resize the image such that the width of panorama images or the height of portrait images will be set to the desired pixel length. If you check Shrink Only images which have a lower long side than the desired length will not be resized.

batch resize
batch resize

The Transform panel allows you to rotate or flip all images. The gray text next to the panel title indicates if a panel is active or not. The example below shows a configuration which resizes all images by 50% and then rotates them by 180°.

batch transform
batch transform


After you configured the batch processing according to your needs you can hit OK. A progress bar will appear which indicates the percentage of images already processed. If you notice a wrong configuration, you can cancel the processing. All images processed will stay the same then but the processing is stopped immediately.

processing images
processing images

All processing actions are logged. Choose Show Log to see the status of the processing. You can see the status of every batch module and check if it was processed successfully. Please check the batch configuration before Processing especially if you check Overwrite Existing files since these actions cannot be reverted.

log file
log file

Overview Panel (Zooming)

The Overview Panel (Menu > Panels > Overview) enhances zoom and pan. The blue rectangle shows the current viewing area. You can pan to a specific location by dragging this rectangle to the desired position. The scrollbar at the bottom allows you to zoom. If you want to zoom to a desired factor (e.g. 600 %) you can mark and replace the text accordingly.

Overview Panel
Overview Panel