Canon EOS-1D Dicas e técnicas - Página 28

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Reviewing Images on the

Camera's LCD Monitor

Monitor Evaluation Vs.

Printed Output

IV. SHARPNESS EVALUATION

The first step in evaluating image quality for most EOS Digital SLR users is checking the

LCD monitor during Review or Playback. The Mark II cameras are equipped with a zoom

function that magnifies captured images up to 10x with a scrolling function to examine

specific details. It's important to understand that the image used for reviewing purposes

is actually a small JPEG (approximately 1,536 x 1,024 pixels) that's embedded into the

file specifically for this purpose. This method drastically speeds up the review process

compared to reading the full resolution file. The trade-off is that the level of detail is

limited. There's enough data in the embedded JPEG to see (for instance) whether a

subject's eyes were open or closed, or to get a rough idea of focusing accuracy, but not

enough to read extremely fine detail. In other words, it's not possible to determine the

actual sharpness of the image by looking at the camera's LCD monitor only. The next

step towards evaluating image quality is downloading your images to a personal

computer to view or print.

Most experts suggest that the best way to evaluate the quality of a digital image is to

view it at 100% magnification on a high-quality monitor. When the objective is image

editing, this is good advice. These same experts also point out that average human

vision cannot resolve more than 300 ppi (pixels per inch) for printed output. Using these

specifications, please review the following chart:

Camera Model Max. Resolution

4.1MP

EOS-1D

(2464 x 1648)

8.2MP

EOS-1D Mark II

(3504 x 2336)

11.1MP

EOS-1Ds

(4064 x 2704)

16.7MP

EOS-1Ds Mark II

(4992 x 3328)

Clearly, there is a tremendous difference between image dimensions on screen at 100%

magnification and image dimensions at 300 ppi. EOS-1 class digital SLRs produce

images so large that viewing them at 100% magnification is like viewing a poster-sized

print. Also, keep in mind that most people view their monitors at much closer range

than the normal viewing distances for prints. Under these conditions, the image is

IV. SHARPNESS EVALUATION

Image Dimensions @ 72 dpi

(Screen resolution)

34.2 X 22.9 inches

(2.8 x 1.9 ft.)

48.7 x 32.4 inches

(4.1 x 2.7 ft.)

56.4 x 37.6 inches

(4.7 x 3.1 ft.)

69.3 x 46.2 inches

(5.8 x 3.9 ft.)

Image Dimensions @ 300 ppi

(Printing resolution)

8.2 x 5.5 inches

11.7 x 7.8 inches

13.5 x 9.0 inches

16.6 x 11.1 inches