Das Bild wird dadurch klarer, dass die Bildauflösung höher ist.

Dadurch, dass is a common German structure that introduces the reason or mechanism for something.

In this sentence, it means something like:

• through the fact that
• by the fact that
• very naturally in English: because

So the sentence says that the picture becomes clearer because / by the fact that the image resolution is higher.

A useful way to see it is:

• Dadurch = through that / as a result
• dass ... = the clause that explains what that that refers to

So dadurch, dass die Bildauflösung höher ist means through the fact that the image resolution is higher.

Because dass introduces a subordinate clause, and in German subordinate clauses are separated from the main clause by a comma.

Here the parts are:

• Main clause: Das Bild wird dadurch klarer
• Subordinate clause: dass die Bildauflösung höher ist

So the comma is required.

This is one of the most important word-order patterns in German.

In a main clause, the finite verb goes in second position:

• Das Bild wird dadurch klarer

Here, wird is the finite verb, so it comes second.

In a subordinate clause introduced by dass, the finite verb goes to the end:

• dass die Bildauflösung höher ist

So:

• main clause → verb in second position
• dass clause → verb at the end

That is why you get wird near the beginning, but ist at the end.

Because werden + adjective often means to become.

So:

• Das Bild ist klar. = The picture is clear.
• Das Bild wird klarer. = The picture becomes clearer.

Here the sentence is talking about a change: the image is getting clearer, not simply describing its state.

So wird klarer is the natural choice.

In German, most adjectives form the comparative by adding -er:

• klar = clear
• klarer = clearer
• hoch = high
• höher = higher

So klarer is simply the normal comparative form of klar.

German usually prefers this comparative form instead of something like mehr klar.
Mehr klar can exist in some contexts, but it is not the normal way to say clearer here.

Because the sentence does not explicitly say what the picture is being compared to.

German uses als when both sides of the comparison are stated:

• Das Bild ist klarer als vorher. = The picture is clearer than before.

But here the sentence only says that the picture becomes clearer. It does not say than what. That is completely normal.

So:

• klarer alone = clearer
• klarer als ... = clearer than ...

Because Auflösung (resolution) is treated like something that can be high or low in German, just as in English.

So:

• eine hohe Bildauflösung = a high image resolution
• die Bildauflösung ist höher = the image resolution is higher

The comparative of hoch is irregular:

• hoch = high
• höher = higher

That is why you see höher, not something like hocher.

It is in the nominative, because it is the subject of the subordinate clause:

• dass die Bildauflösung höher ist

You can identify it by asking: What is higher?
Answer: die Bildauflösung

So in that clause:

• die Bildauflösung = subject
• ist = verb
• höher = predicate adjective

Because Bildauflösung is a compound noun, and in German the grammatical gender of a compound is determined by the last part.

• das Bild = the image/picture
• die Auflösung = the resolution

The full compound is:

• die Bildauflösung

Since the last element is Auflösung, which is feminine, the whole compound is feminine.

This is a very important rule for German compound nouns.

Yes, you could say:

Das Bild wird klarer, weil die Bildauflösung höher ist.

That is a perfectly natural sentence.

The difference is mainly one of nuance:

• weil = straightforward because
• dadurch, dass = emphasizes the way or mechanism by which something happens

So:

• weil sounds more direct and simple
• dadurch, dass sounds a bit more explanatory: it becomes clearer through the fact that...

Both are correct here.

In the sentence Das Bild wird dadurch klarer, dadurch belongs closely to the idea of becomes clearer through that.

German often places adverbial elements like dadurch in the middle field of the sentence, before the adjective or other information that follows.

This position is natural and neutral.

You may also hear slightly different word orders in other contexts, but this version is the standard, smooth one for this sentence.

Yes. In the main clause, Das Bild is the subject:

• Das Bild = subject
• wird = verb
• dadurch klarer = predicate part

Then the dass clause explains the reason/mechanism:

• dass die Bildauflösung höher ist

So the sentence has:

1. a main clause about the picture
2. a subordinate clause about the image resolution

Each clause has its own subject and verb.

Yes, depending on context.

• das Bild can mean picture, image, or sometimes photo
• die Bildauflösung means image resolution or picture resolution

In technical contexts, English often prefers image, especially in image resolution, while in everyday contexts picture may sound more natural for Bild.

So the German sentence mixes an everyday noun (Bild) with a technical compound (Bildauflösung), which is very normal.