Resize images using GIMP without losing quality

Gimp can be downloaded from

Here is a quick way to resize any image without losing its quality:

  • open your image,
  • go to the image menu → scale image,
  • insert the desired values for scaling in the image size tab,
  • under the quality, select «Sinc (Lanczos3)».

Visit these websites to find more about lanczos resampling and for the differences between other resampling methods.

14 εφαρμογές ανοιχτού κώδικα για επεξεργασία φωτογραφιών

Η επεξεργασία φωτογραφιών είναι ένα πεδίο που ακόμα οι εφαρμογές κλειστού κώδικα κυριαρχούν στις προτιμήσεις και στις συνήθειες των χρηστών. Για να μην περιορίζεστε από εμπορικές εφαρμογές και κλειστά πρότυπα, υπάρχει και ένας άλλος τρόπος για την επεξεργασία των φωτογραφιών: o open source τρόπος. Δείτε 14 δημοφιλείς open source εφαρμογές φωτογραφίας, που αναδεικνύουν την ποικιλία επιλογών και καινοτομιών που υπάρχει στον κόσμο του ανοιχτού λογισμικού.

Image Processing Tutorial for Beginners: Includes object detection, filtering, and more!

Perfect for the beginner, this demo illustrates simple object detection (segmentation, feature extraction), measurement, and filtering. Requires the Image Processing Toolbox (IPT) because it demonstrates some functions supplied by that toolbox, plus it uses the «coins» demo image supplied with that toolbox. If you have the IPT (you can check by typing ver on the command line), you should be able to run this demo code simply by copying and pasting this code into a new editor window, and then clicking the green «run» triangle on the toolbar.

How to easily colorize a black-and-white photograph in Photoshop!

Coloring a photo isn’t nearly as hard as you might think. In fact, it can be achieved in three simple steps using Photoshop. Read on for a basic method of colorizing a black-and-white picture, followed by some tips for building on this technique to create more stylized and dramatic results.

Using the Lens Blur Filter on an image Sequence in Photoshop CS6

Even with the fantastic new Blur Gallery in Photoshop CS6, the Lens Blur filter is an essential tool when a high degree of control is needed to selectively (and realistically) blur an image. In this video tutorial, Julieanne uses the Lens Blur filter with a depth map to to create a series of images that appear as if they were captured with a tilt-shift lens. Julieanne also demonstrates how to quickly apply this filter to multiple images using actions and batch processing.

Μετάβαση σε γραμμή εργαλείων