In the case of images, the color profile is usually just the color space, embedded within the image. We'll look at these in more detail shortly. There are a lot of different color spaces that use the RGB color model, the main ones being sRGB, AdobeRGB, and ProPhoto RGB. These describe a specific implementation of how the data should be mapped to colors, based on the color model. Within a color model, you then have color spaces. So, for this article we'll just be looking at the RGB color model. RGB is the most common color model, used for editing images and displaying images.Īlthough your Lab or printer may print using CMYK, they will normally want your image in an RGB color space as well (then they will convert the image to CMYK upon printing). There are different color models, such as CMYK (used for printing), LAB (used for converting from one color model or space to another, sometimes used for editing), and RGB. The first is the color model, this is a mathematical model that describes how color can be represented as numbers (data). Or to make sure you convert your image to the sRGB color space before posting an image on the web.īut what's the difference between these color spaces, and why does it matter what color space an image has? How do you change the color space of an image? That's what we'll look at in this article.įirst things first, there are 3 aspects involved with displaying color from a digital image. You can read more about the DCI-P3 colorspace on Wikipedia.Sometimes you might read advice about using the ProPhoto RGB color space for editing. This color space uses the DCI P3 primaries, a D65 white point, and the same gamma curve as the sRGB color space. The name of the Display P3 color space, created by Apple Inc. Which leads us to Apple Core Graphics documentation which says: With ExifTool, looking for tags starting with Profile, I found: Profile CMM Type : Apple Computer Inc. Apple is, in fact, using Something Else, and that's found elsewhere in the metadata. Some cameras use them to mean Adobe RGB or something else, but this is non-standard. The only standard values are 1 (sRGB) and 65535 ("uncalibrated"). Thumbnail Image : (Binary data 9560 bytes, use -b option to extract)įocal Length : 4.0 mm (35 mm equivalent: 28.0 mm)įor whatever reason, the ColorSpace tag is not very useful in EXIF. Green Tone Reproduction Curve : (Binary data 32 bytes, use -b option to extract)Įncoding Process : Baseline DCT, Huffman coding Profile Copyright : Copyright Apple Inc., 2017 Lens Model : iPhone 8 back camera 3.99mm f/1.8ĭevice Attributes : Reflective, Glossy, Positive, ColorĬonnection Space Illuminant : 0.9642 1 0.82491 Sensing Method |One-chip color area sensorĮXIF data contains a thumbnail (9560 bytes). Subject Area |Within rectangle (width 753, height 756) around (x,y) = (3Ĭolor Space |Internal error (unknown value 65535) +-įlash |Flash did not fire, compulsory flash mode $ exif IMG_8995.JPGĮXIF tags in 'IMG_8995.JPG' ('Motorola' byte order): Is there a better source which tells me the true color space of the photos? I want to embed them in a PDF file and for this specify the correct color space. Some sources say this value means "uncalibrated", but that information is of no help. While my old iPad mini photos say their color space is sRGB, my new iPhone 8 photos tell me their color space is "65535" ("unknown value").
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