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Creating Input Profiles. (Color managing your scanner and digital camera). How do cameras see color?. A typical digital camera image sensor is actually a grayscale analog device The sensor is made up of light-sensitive photosites (corresponding to pixels)

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creating input profiles

Creating Input Profiles

(Color managing your scanner and digital camera)

how do cameras see color
How do cameras see color?
  • A typical digital camera image sensor is actually a grayscale analog device
  • The sensor is made up of light-sensitive photosites (corresponding to pixels)
  • The photosites are covered by a pattern of color filters
the analog to digital converter
The Analog to Digital Converter
  • The ADC changes the analog signal into a digital numerical value (still one color per pixel)
  • If set to raw capture, the camera simply records these values along with metadata tags to the memory card
the image processing pipeline
The Image Processing Pipeline
  • If raw, then the raw conversion software then produces the image’s color (among other things) by interpolating the existing color data
  • If jpeg, then this process is done in-camera
scanners are simpler
Scanners are simpler
  • They also capture color data using color filters and an image sensor, but they capture all three primary colors at every pixel
  • No interpolation of color data
difficulties in creating input profiles
Difficulties in creating input profiles
  • Scanner profiles are actually pretty easy
  • They have a fixed light source
  • Exposure doesn’t change
  • Usually scan limited gamut sources such as printed materials
difficulties in creating input profiles9
Difficulties in creating input profiles
  • Cameras can be a pain
  • Unlimited possible light sources
  • Varied exposure by design
  • Vastly varied spectral stimuli
  • Infrared/Ultraviolet sensitivity?
  • Can require multiple color profiles
the good news
The Good News
  • In many VR contexts, cameras are treated similarly to scanners
  • Copystand/controlled lighting
  • Fixed exposure/white balance
  • Limited gamut source material
profiling needs12
Profiling Needs
  • Target (reflective or transparency)
  • Target description file
  • Software capable of creating an input profile
scanner profiling
Scanner Profiling
  • Make sure scanner has had a chance to warm up (half hour)
  • Turn off all auto correction options in scanning software
scanner profiling15
Scanner Profiling
  • Save settings for future use (need to use same settings for future scans)
  • Scan, save as tif (don’t embed profile)
scanner profiling17
Scanner Profiling
  • Straighten and crop, if necessary (get this right at the time of scan, if possible)
  • Clone out dust or scratches in Photoshop, if necessary
set resulting profile as default in scanning software22
Set resulting profile as default in scanning software
  • If that’s not possible, create a Photoshop action to ASSIGN your profile to future scans
  • Be sure to CONVERT profile to standard Adobe RGB or sRGB before any color or tonal editing
slide23

ProPhoto RGB Profile

(similar to a camera or scanner custom profile)

--------Converted to---------

Adobe RGB Profile

(commonly used in photographic applications)

--------Converted to---------

sRGB Profile

(the most common colorspace; for all intents and purposes, the colorspace of the web)

digital camera profiling jpg
Digital camera profiling (jpg)
  • Very similar to scanner profiling
  • Make sure lighting is even
  • Set a custom white balance
  • Set optimal exposure (check RGB histograms, if available)
digital camera profiling raw
Digital camera profiling (raw)
  • Not just profiling the camera – also raw converter
  • Raw converter already contains profiles, but profiles can ignored and replaced or,
  • Raw converter can be calibrated
editing profiles
Editing profiles
  • Use software capable of editing input profiles to make color adjustments to the scanned/shot image (which will then be applied to the profile
  • Or, fake it – use photoshop to make opposite changes to your scanned/shot target, then rebuild the profile
  • Either approach involves some trial and error