Photography Asked on April 13, 2021
In the past I’ve seen scenes in documentaries containing a branded product which (I assume) didn’t pay for product placement, so somehow they manage to subtly blur out its label in post production. I think I’ve seen a similar technique being used to subtly blur license plates.
Any idea how this effect is commonly produced? I don’t think it’s your run-of-the-mill Gaussian blur in Photoshop. I feel like it must be some clever use of a spot healing brush-like technique to “scramble” the product label in a subtle way so that it becomes very hard to read.
I cannot find any good examples of this right now, unfortunately.
In many cases, it would be easier to entirely remove the logo using cloning, healing, or in-painting techniques.
In cases, such as faces where it makes more sense to obscure, different blurring methods are available, such as median blur and gaussian blur. Their strength can be controlled by adjusting parameters, such as radius and strength.
To pixelate a face, you can use any of a set of "Pixelate" filters, such as Mosaic. In GIMP, they can be found listed under "Distorts".
Your question specifically references documentaries and other video contexts. Consider searching for an answer at video.stackexchange.com. For instance, Selectively blur many but not all of the faces in a video suggests using motion tracking with keyframing to move a gaussian mask.
The example image you provided does not appear to have had any special processing to obscure the logo. Everything in the image is generally not sharp. This is likely caused by small sensor size, small aperture, and low resolution. Also apparent is low dynamic range and a fair amount of noise.
Consider the amount of additional effort required to "subtly" obscure logos vs their simply being unreadable because of the technology or techniques used to capture them.
Correct answer by xiota on April 13, 2021
Obscuring part of an image, as in a logo, can be done in ImageMagick, where the position and size of the logo on the main image is defined by its geometry, to which a mask is applied. A blur is then applied to the masked area. The blur can be as aggressive as required.
This can be set up in a script and repeated over a number of images or, assigned to different locations (geometry) for individual images.
Rather than copy the work of others, the linked threads use syntax for use with Unix systems, Windows is not too dissimilar.
Answered by GeorgeC on April 13, 2021
The most common way of doing what you want (and probably the easier and the one that renders the best results) is in postproduction with photoshop (Akvis Photo or a similar retouching tool):
Make a copy of the previous bitmap layer copy as new bitmap layer, use the selection tool this latest layer to create a selection for the logo layer and convert it to a mask the layer. Set the properties of the mask to soft edges (a few pixels).
Use the the cloning tool on this last layer to remove the logo from this bitmap layer, enable/disable the mask and invert it as needed.
Now you’ll have two pictures: one without logo, when you enable the show/view property of every layer (you can keep the background layer disabled if you wish) including the uppermost masked layer, and another with a logo when you disable the show/view property of the upper most layer.
Answered by abetancort on April 13, 2021
Quick and easy way is just to upload photo to online service for example https://blur-photo.com/ , which can do the job of blurring part of image.
Answered by Lukáš Irsák on April 13, 2021
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