Using the histogram to avoid clipping your highlights and shadows

Jovan Stosic November 4, 2023

What the Histogram looks like

Histogram example

Histogram example

Shadows, Midtones, Highlights

Far left to 0 indicates how much shadow detail is present
Far right to 255 indicates how much highlight detail is present
The midway point indicates how much midtone detail is present

Anything beyond 255 is completely white with no detail present. Anything below 0 is completely black with no detail present.
You can also think of these as colours:
Shadows = Black or dark colours
Midtones = Grey or muted colours
Highlights = White or bright colours

The height of each line represents the amount of pixels in your image that contain that tone. So for example, the big peak shows there are a lot of pixels containing the tonal value. Notice also that on the far left there is an area with no lines. This means that there are no pixels with those tonal values. So there are no dark shadows from 0 to about 10.

https://blog.ianmiddletonphotography.com/2017/12/05/using-the-histogram/

Using the histogram to avoid clipping your highlights and shadows was last modified: November 11th, 2023 by Jovan Stosic

virtualbox – Why is my virtual machine inaccessible?

Jovan Stosic October 25, 2023

Go to the location where you store your VM /home/ron/VirtualBox VMs/Semios Win7 /.Open .vbox in your favorite text editor to check if it is empty. Probably it is 🙂 In the same folder you should have file Semios Win7 .vbox-prev. Copy the contents of this file to Semios Win7.vbox, save, and try again.

Source: virtualbox – Why is my virtual machine inaccessible? – Ask Ubuntu

virtualbox – Why is my virtual machine inaccessible? was last modified: October 25th, 2023 by Jovan Stosic

Curvilinear coordinates

Jovan Stosic October 22, 2023

In geometry, curvilinear coordinates are a coordinate system for Euclidean space in which the coordinate lines may be curved. These coordinates may be derived from a set of Cartesian coordinates by using a transformation that is locally invertible (a one-to-one map) at each point. 

https://en.wikipedia.org/wiki/Curvilinear_coordinates#:~:text=In%20geometry%2C%20curvilinear%20coordinates%20are,one%20map)%20at%20each%20point.

Curvilinear coordinates was last modified: October 22nd, 2023 by Jovan Stosic

Gregorio Ricci-Curbastro

Jovan Stosic October 17, 2023

Gregorio Ricci-Curbastro (Italian: [ɡreˈɡɔːrjo ˈrittʃi kurˈbastro]; 12 January 1853 – 6 August 1925) was an Italian mathematician. He is most famous as the discoverer of tensor calculus.

With his former student Tullio Levi-Civita, he wrote his most famous single publication, a pioneering work on the calculus of tensors, signing it as Gregorio Ricci. This appears to be the only time that Ricci-Curbastro used the shortened form of his name in a publication, and continues to cause confusion.

Ricci-Curbastro also published important works in other fields, including a book on higher algebra and infinitesimal analysis,and papers on the theory of real numbers, an area in which he extended the research begun by Richard Dedekind.

https://en.wikipedia.org/wiki/Gregorio_Ricci-Curbastro

Gregorio Ricci-Curbastro was last modified: October 17th, 2023 by Jovan Stosic