Some initial observations:

You do not read a magazine at 2 m. from you. Lets think that you read it at 30 cm.

But you can see a poster at 60cm, or a bus stop add at 1 or 2 m.

[![][1]][1]

As you get further away you need less resoluiton on your print.

So the first point is define your viewing distance.

If what you want is a wall mounted image on your room, I say it is arround 100-150 ppi. For me 100ppi is enough, so lets do some math:

• 4200px/100ppi = 42 inches.

• 4200px/150ppi = 28 inches.

I would recomend that you print a small fragment of the image on a letter sized paper and then you decide the final resolution. [1]: https://otake.com.mx/Foros/Resolution1.jpg

Some initial observations:

You do not read a magazine at 2 m. from you. Lets think that you read it at 30 cm.

But you can see a poster at 60cm, or a bus stop add at 1 or 2 m.

As you get further away you need less resoluiton on your print.

So the first point is define your viewing distance.

If what you want is a wall mounted image on your room, I say it is arround 100-150 ppi. For me 100ppi is enough, so lets do some math:

• 4200px/100ppi = 42 inches.

• 4200px/150ppi = 28 inches.

I would recomend that you print a small fragment of the image on a letter sized paper and then you decide the final resolution.

Some initial observations:

You do not read a magazine at 2 m. from you. Lets think that you read it at 30 cm.

But you can see a poster at 60cm, or a bus stop add at 1 or 2 m.

http://otake.com.mx/Foros/Resolution1.jpg

As you get further away you need less resoluiton on your print.

So the first point is define your viewing distance.

If what you want is a wall mounted image on your room, I say it is arround 100-150 ppi. For me 100ppi is enough, so lets do some math:

• 4200px/100ppi = 42 inches.

• 4200px/150ppi = 28 inches.

I would recomend that you print a small fragment of the image on a letter sized paper and then you decide the final resolution.

Some initial observations:

You do not read a magazine at 2 m. from you. Lets think that you read it at 30 cm.

But you can see a poster at 60cm, or a bus stop add at 1 or 2 m.

[![][1]][1]

As you get further away you need less resoluiton on your print.

So the first point is define your viewing distance.

If what you want is a wall mounted image on your room, I say it is arround 100-150 ppi. For me 100ppi is enough, so lets do some math:

• 4200px/100ppi = 42 inches.

• 4200px/150ppi = 28 inches.

I would recomend that you print a small fragment of the image on a letter sized paper and then you decide the final resolution. [1]: https://otake.com.mx/Foros/Resolution1.jpg