Projekcijsko platno je veliko.

A word-by-word breakdown is:

• projekcijsko = projection / for projecting
• platno = screen or literally canvas/cloth
• je = is
• veliko = big / large

So the structure is basically:

• projekcijsko platno = projection screen
• je veliko = is big

Because they are agreeing with platno, which is a neuter singular noun.

In Croatian, adjectives must agree with the noun they describe in:

• gender
• number
• case

Here:

• platno is neuter
• it is singular
• it is in the nominative case

So the adjectives also take the neuter singular nominative form:

• projekcijsko platno
• platno je veliko

Compare:

• velik stol = a big table (masculine)
• velika soba = a big room (feminine)
• veliko platno = a big screen/canvas (neuter)

In Croatian, nouns have grammatical gender: masculine, feminine, or neuter.

A very common pattern is that nouns ending in -o or -e are neuter, and platno ends in -o, so it is neuter.

That is why the adjectives around it are also neuter:

• projekcijsko
• veliko

Je is the 3rd person singular present tense form of the verb biti = to be.

So:

• je = is

In this sentence, it links the subject and the description:

• Projekcijsko platno = the projection screen
• je veliko = is big

This is the normal Croatian equivalent of an English is sentence.

Croatian does not have articles like English a/an and the.

So platno can mean:

• a screen
• the screen

The exact meaning depends on context.

That means Projekcijsko platno je veliko. could be understood as:

• The projection screen is big.
• A projection screen is big.

In most real contexts, it would usually be interpreted as the projection screen is big.

Yes. Projekcijsko platno is a noun phrase where:

• projekcijsko describes the type of screen
• platno is the main noun

So together they mean projection screen.

Croatian often uses an adjective + noun structure where English may also use a noun + noun structure or an adjective + noun structure.

It is in the nominative singular.

Why nominative?

Because platno is the subject of the sentence:

• Projekcijsko platno = the thing being talked about
• je veliko = what is said about it

The predicate adjective veliko also appears in the nominative because it agrees with the subject in this kind of X is Y sentence.

Because velik is the masculine form, while veliko is the neuter form.

Here are the basic forms:

• velik = masculine
• velika = feminine
• veliko = neuter

Since platno is neuter, you need:

• platno je veliko

Not:

• platno je velik

Yes, Croatian word order is more flexible than English, although some versions sound more neutral than others.

The most neutral order here is:

• Projekcijsko platno je veliko.

You may also hear:

• Veliko je projekcijsko platno.

But that changes the emphasis. It can sound more marked, contrastive, or stylistic.

For a learner, the best default is:

• subject + je + adjective
• Projekcijsko platno je veliko.

Yes. It is related to projekcija = projection.

The adjective projekcijski / projekcijska / projekcijsko means something like:

• projection
• projecting-related
• used for projection

Because platno is neuter, the neuter form is used:

• projekcijsko platno

A rough pronunciation guide for an English speaker is:

• pro-yek-TSEE-y-sko PLAHT-no ye VEH-lee-ko

A few helpful notes:

• j is pronounced like English y
• c is pronounced like ts
• je sounds roughly like ye
• lj and nj are special sounds in Croatian, but they do not appear here

The stress can vary somewhat by region, but that rough guide will get you close enough to be understood.

Not always. Platno originally means cloth or canvas, and by extension it is also used for a projection screen.

So depending on context, platno can refer to:

• canvas
• cloth
• screen surface
• projection screen

In projekcijsko platno, the meaning is clearly projection screen.

Yes, if the context already makes it clear which screen you mean.

• Projekcijsko platno je veliko. = more specific
• Platno je veliko. = The screen/canvas is big

Croatian often leaves out extra descriptive words when they are already understood from context.