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Archive for the ‘Image Editing’ Category

Do not blur, but do randomly add noise or move pixels – Censoring image in GIMP – Graphic Design Stack Exchange

Posted by jpluimers on 2019/05/03

Blurring is like a hash function: it cannot be undone, but with enough plain text to blur examples, you can reconstruct the plain text: [WayBack] Why blurring sensitive information is a bad idea | dheera.net | Dheera Venkatraman’s web site

As an alternative, randomly add noise or move pixels. I used  [WayBack] Censoring image in GIMP – Graphic Design Stack Exchange. For the example on the right, I used “Filters → Noise → Spread” from the Stack Exchange answer.

With enough randomness, it is much harder to construct plain/hash combinations.

–jeroen

Posted in Image Editing, LifeHacker, Power User, Security, The Gimp | Leave a Comment »

Compressing and enhancing hand-written notes

Posted by jpluimers on 2018/09/21

Interesting tool:

I wrote a program to clean up scans of handwritten notes while simultaneously reducing file size.

Source: Compressing and enhancing hand-written notes [WayBack]

via:

Posted in Image Editing, Power User | Leave a Comment »

Animated SVG vs GIF [CAGEMATCH]

Posted by jpluimers on 2017/01/13

Often, SVG animates a lot better than GIF. Keep this in mind:

Not only should the image be a good candidate for SVG, but SVG should also be a good candidate for the image.

such as:

  • Logos,
  • non-complex,
  • vector-based illustrations,
  • user interface controls,
  • infographics,
  • and icons.

–jeroen

Source: Animated SVG vs GIF [CAGEMATCH]

Posted in Image Editing, Power User | Leave a Comment »

Steps for adjusting a whiteboard photo in Gimp

Posted by jpluimers on 2015/12/28

A long time ago, I wrote about Steps for adjusting a whiteboard photo in Paint.NET.

GIMP does an even better job with these steps:

Once: install the clean-whiteboard-photo script

  1. Visit https://github.com/kyleburton/sandbox/blob/master/gimp/clean-whiteboard-photo.scm
  2. Click “raw”
  3. Hit “Ctrl-S” to save the file as file-type “*.txt” and file-name  “%temp%\clean-whiteboard-photo_scm.txt”
  4. Go to the folder “%temp%”
  5. In there,
    1. select the firle  “clean-whiteboard-photo_scm.txt”,
    2. change it into  “clean-whiteboard-photo.scm”,
    3. copy the file
  6. Go to the folder  “C:\Program Files\GIMP 2\share\gimp\2.0\scripts”
  7. Paste the file (you need to confirm Administrator rights through UAC)

The above steps will add this menu option to GIMP: menu “Filters” -> “Whiteboard” -> “Clean whiteboard photo”

For every picture: make it less ugly

  1. Start GIMP 2
  2. Open the picture
  3. With the “Rectangle Select” Tool (R), select the area of the whiteboard that you want to enhance
    1. If the area is not completely rectangular, make the selection large enough to cover everything needed in the final picture
  4. Only when the selection needs adjustment to make it rectangular:
    1. Choose the “Perspective” Tool (Shift-P)
    2. Drag the incorrect corners until the selection is rectangular
    3. In the “Perspective” tool window, click “Transform” to confirm
    4. The selection now is not rectangular any more, so deselect everything:
      1. In the menu, choose “Select” -> “None” (Shift-Ctrl-A)
  5. With the “Rectangle Select” Tool (R), select the area of the whiteboard that you want to enhance
  6. In the menu, choose “Image” -> “Fit canvas to selection”
  7. In the menu, choose “Filters” -> “Whiteboard” -> “Clean whiteboard photo”
  8. Click next to the selection to confirm the cleanup
  9. In the menu, choose “File” -> “Export”
    1. Save the file under a new name (often a PNG extension will give better compression than JPEG, and has less artifacts as well)

–jeroen

via: Steps for adjusting a whiteboard photo in Paint.NET « The Wiert Corner – irregular stream of stuff.

Posted in Image Editing, Power User | Leave a Comment »

Steps for adjusting a whiteboard photo in Paint.NET

Posted by jpluimers on 2014/03/21

Based on a few links, these are the steps I used to enhance the photo of a whiteboard using Paint.NET:

  1. Auto-Level
  2. Reduce-Noise=Max
  3. Duplicate-Layer
  4. Gaussian-Blur=20
  5. Invert Colors
  6. Layer-Blend-Mode=Color Dodge
  7. Reduce-Noise=Max

These are the links I used to come to this list:

Below are the steps on an image I got from The collective awareness | Idea By Window. Read the rest of this entry »

Posted in Image Editing, Power User, Windows, Windows 7, Windows Vista, Windows XP | 1 Comment »

 
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