Vi endrer utsnittet under redigeringen dersom forgrunnen dekker ansiktet.

Because utsnittet is the definite form of utsnitt, meaning the crop / the framing / the section shown.

• et utsnitt = a crop / a framing / an excerpt
• utsnittet = the crop / the framing

In this sentence, the speaker is referring to a specific crop or framing in the video or image, so Norwegian uses the definite form.

Here, utsnittet most naturally means something like:

• the framing
• the crop
• the visible image area

In editing language, it refers to what part of the picture is being shown. So this is not an excerpt from a text; it is a visual crop/framing.

Under redigeringen literally means during the editing. It is a compact noun phrase.

Compare:

• under redigeringen = during the editing process
• mens vi redigerer = while we are editing

Both can work, but under redigeringen sounds a bit more formal or technical, and it focuses on the process as a whole rather than the action of people editing.

Because redigering is a common-gender noun, and here it is in the definite singular form:

• en redigering = an editing / an edit
• redigeringen = the editing

Norwegian often uses the definite form where English might use a more general phrase like during editing. So under redigeringen is very natural.

Dersom means if.

In most cases, dersom and hvis mean the same thing:

• dersom = if
• hvis = if

The difference is mostly style:

• dersom can sound a bit more formal or written
• hvis is very common in everyday language

So this sentence could also be:

• Vi endrer utsnittet under redigeringen hvis forgrunnen dekker ansiktet.

That would still be correct.

Forgrunnen is the definite form of forgrunn, meaning the foreground.

• en forgrunn = a foreground
• forgrunnen = the foreground

In image/video descriptions, Norwegian often uses the definite form because it refers to the specific foreground of the image being discussed.

Ansiktet is the definite singular form of ansikt:

• et ansikt = a face
• ansiktet = the face

The sentence is talking about a specific face in the shot, so the definite form is used.

Also note that ansikt is a neuter noun, which is why the indefinite article is et.

Norwegian often uses the present tense for:

• general procedures
• instructions
• habitual actions
• descriptions of what is normally done

So Vi endrer utsnittet ... dersom forgrunnen dekker ansiktet means something like:

• We change the framing if the foreground covers the face
• We change the crop whenever the foreground covers the face

It is not necessarily happening right now; it may describe a general rule or standard practice.

Yes. In dersom forgrunnen dekker ansiktet, the word order is normal for a subordinate clause:

• dersom = subordinating conjunction
• forgrunnen = subject
• dekker = verb
• ansiktet = object

So the clause is built like:

dersom + subject + verb + object

That is completely normal.

A useful thing to remember is that if the dersom-clause comes first, the main clause would usually have inversion:

• Dersom forgrunnen dekker ansiktet, endrer vi utsnittet under redigeringen.

Notice endrer vi, not vi endrer.

Sometimes, depending on context, yes—but not always.

Possible translations include:

• the crop
• the framing
• the composition
• sometimes the shot

But shot can also correspond to other Norwegian words, depending on context, such as bilde, innstilling, or tagning.

So in this sentence, the framing or the crop is probably the safest choice.

Yes, it is natural, especially in a technical, editing, or instructional context.

It sounds like something you might read in:

• editing guidelines
• production notes
• a manual
• a workflow description

A slightly less formal version could be:

• Vi endrer utsnittet mens vi redigerer hvis forgrunnen dekker ansiktet.

But the original sentence is perfectly correct and natural.