Shot for a Wall

[dediux]

Hi,

I've to create an image for a Wall (2mx3m) in a waiting room. So the quality must be excellent.

I shot 12 photography with a Canon 5D, with 28-120mm in RAW, but when i make an Automatic Photomerge in Photoshop and I enlarge the photo for the right width and height, the quality become to 59dpi.

For an optimal printed Wall is better 100dpi. It's better I'll take the photo with an Hasselblad or similar for having the right quality or I make an error during the post-processing?


(Sorry for the language)
Davide Morotti

[Doug Sundseth]

You're going to need more pixels. If we assume a wall 15' long by 8' high, you'll need around 180MPx in your final composite, If you're shooting with a 30% overlap, you'll be able to use about 1/2 the pixels from each pane of the composite (70% horizontal x 70% vertical = 49%, though actually more because two edges will use more pixels).

You can do this by shooting fewer shots with a bigger sensor or more shots with a smaller sensor. With the Canon, you should be able to zoom farther into the scene and take more rows and columns for your panoramic stitch. Three rows by seven columns or two rows by 10 columns will probably give you enough for my hypothetical wall if I recall the sensor size of that camera approximately correctly.

Just remember that for any given resolution and aspect ratio, the number of pixels required will rise with the square of the height (or width).

[dediux]

Originally Posted by Doug Sundseth

You're going to need more pixels. If we assume a wall 15' long by 8' high, you'll need around 180MPx in your final composite, If you're shooting with a 30% overlap, you'll be able to use about 1/2 the pixels from each pane of the composite (70% horizontal x 70% vertical = 49%, though actually more because two edges will use more pixels).

You can do this by shooting fewer shots with a bigger sensor or more shots with a smaller sensor. With the Canon, you should be able to zoom farther into the scene and take more rows and columns for your panoramic stitch. Three rows by seven columns or two rows by 10 columns will probably give you enough for my hypothetical wall if I recall the sensor size of that camera approximately correctly.

Just remember that for any given resolution and aspect ratio, the number of pixels required will rise with the square of the height (or width).

Very useful reply, thank you for the tip.

Have a good time!