Secret of Digital Processing

Printing

One of the great questions that assail some users of digital cameras is: "I can show my digital photos?" I can only see the photos on the computer or TV? ". The answer is: "Yes, we can." It can show digital photos, or better expressed, print digital photos, as revealed similar process is already produced in the same chamber, and there are several options, ranging from home printing with a wide range of printers ranging from the most basic color inkjet with the latest models of digital photo printers designed specifically for the domestic market, to the professional impression centers revealed.

What Size I have to take my shots?

Although the article focuses on the latter type of development, the concepts explained here will work for all kinds of printing or revealed. The first question that assaults the photographer is, "that I have to size my photos?” Because until now we were driving a reel type, the 35 mm (Is there more?), But now our camera lets you select different photo sizes, which would equate in some way to get other types of reels in our old camera .

In order to decide properly, we need to manage three concepts.

Image Size

Size is measured in number of dots (pixels): width x height

Depending on the camera, we have different sizes such as 1024x760, 1600x1200, 2272x1704, ...

Image resolution

Measured in points per inch (dpi; in English, dots per inch (dpi))

Equivalence between inch and centimeter

1 inch equals 2.54 cm.

The concept of pixels of resolution we have all more or less clear, since comntinuamente we apply it in the screen of your computer. However, how this happened to paper? Will it be good? How I can print size? To resolve these doubts did simple mathematical exercises.

At the time of our photo printing paper, the final sizes that will occupy our picture depend on the print resolution. Thus, the less resolution applied to the print paper will get larger. But the key question is: what is the normal resolution to print centers that professional development and what is the minimum applicable to the result is good? In principle, the current development processes tend to get a maximum resolution of 300 dpi, although 150 dpi from the results can be more than acceptable.

From the three elements, we generate a formula that can be applied to solve the question: What measure in centimeters will have a photograph printed by size in pixels and the resolution in dpi?

Paper size (cm) = (size photograph (pixels) * 2.54 cm / inch) / resolution (dots per inch)

Application examples:

Exercise 1. What pixel size should have a picture to be printed in 10x15 to 250ppp?

Applying the above formula, we know that

size (pixels) = (15 * 250) / 2.54

Applying the calculation, we obtain 1476.35 pixels, which means that choosing the most similar resolution, 1600 x 1200, would cover this size.