HDR Soft Pro - 4.2 - Macintosh Manual de usuario descargar pdf (Pagina 31)

Photomatix Pro User Guide 29

HDR

High Dynamic Range.

HDR Image

Strictly speaking, an HDR image is an intermediary image with 32 bits per color chan-

nel (96 bits per pixel). An HDR image is the result of merging photos of the same

scene taken under dierent exposure settings and stored in special HDR image

format. The 32-bit intermediary HDR image must be processed with tone mapping

for proper display on standard monitors and prints. It has become very common to

dene "HDR image" as the result of processing the 32-bit HDR image with tone map-

ping, i.e. the tone mapped output, but this is not technically correct.

Histogram

Histograms represent brightness distribution in digital images. They help evaluate

correct exposure. The y-axis represents the amount of pixels and the x-axis represents

the brightness value.

JPEG

A common image le format with two primary strengths – a relatively small le size

and universal compatibility. JPEGs use a lossy compression scheme and should not

be edited and re-saved.

Noise

Statistical variations inherent in the sensor system cause noise. Noise is always pres-

ent, but higher sensitivities and smaller sensors usually generate more noise.

Pixel

Digital pictures consist of pixels, the smallest units. Each pixel has a color that can be

represented by 8 or 16 bits or as a oating-point number (32bit HDR).

PPI

Pixels per Inch. Can be used to describe the actual pixels per inch of a print. Often

confused with DPI (Dots per Inch), used by color printers to print an image.

RAW File

A le containing the raw data from the camera sensor. RAW les do not have a color

prole or other stylistic preferences permanently applied.

TIFF

A comprehensive image format that oers lossless compression schemes for smaller

le sizes with higher quality. This format is suitable for editing and printing but not

publishing on the Web.

Tone Mapping

Processing a 32-bit HDR image into an image that can be properly viewed on

monitors and in prints.

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HDR Soft Pro - 4.2 - Macintosh Manual de usuario Pagina 31