X100 sRGB or Adobe RGB

Started Dec 24, 2012 | Discussions thread
Rand 47
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Re: X100 sRGB or Adobe RGB
In reply to Ryan Williams, Dec 29, 2012

"No, I said for all intents and purposes it's sRGB."

I don't care to get into a debate about this, but this is simply incorrect. ProPhoto RGB as implemented in LR is a much larger colorspace than sRGB. And, while you are correct re LR tonality, it doesn't stop there.

For those interested, from Adobe:

"About color management in Lightroom

Lightroom simplifies color management in your photographic workflow. You don’t need to choose color settings or color profiles until you are ready to output your photos. To take advantage of Lightroom color management, you need to calibrate your computer monitor so that you are viewing accurate color. SeeCalibrate and profile your monitor.

Color spaces, color profiles, and tonal response curves

It’s not necessary for you to understand how Lightroom manages color internally, but the following information may be useful in your workflow.

A color space describes a range or gamut of colors. Various devices in your photographic workflow have different color gamuts in which they can record, store, edit, and output photos. A color profile defines a color space so that Lightroom knows how to manage and convert colors in your photo.

Raw photo files generally don’t have embedded color profiles. For raw files, the Develop module assumes a wide color space based on the color values of the ProPhoto RGB color space. ProPhoto RGB encompasses most colors that cameras can record.

A color profile is also defined by a gamma value, or more accurately, its tonal response curve. The tonal response curve defines how tonal values in the raw image are mapped. To provide useful information in the histogram and RGB value display, Lightroom assumes a gamma value of approximately 2.2. More accurately, it uses a tonal response curve similar to the tonal response curve of the sRGB color space.

While Lightroom uses a tonal response curve to provide information for the histogram and RGB values, it manipulates the raw data before it is tone mapped. Working in this linear gamma avoids many of the artifacts that can result in working with a tone-mapped image.

The Library module stores previews in the Adobe RGB color space. These previews are also used when printing in draft mode.

For rendered files such as TIFF, JPEG, and PSD files, Lightroom uses the image’s embedded color profile to display the image, histogram, and color values. If the image doesn’t have a profile, Lightroom assumes the sRGB profile, and the image may not look as expected on your monitor."

Underline is mine.

Best,

Rand



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