Operating Instructions Software; To Install Camspecs Software; Raw File Conversion; Workflow - Image Engineering camSPECS User Manual

4 OPERATING INSTRUCTIONS SOFTWARE

The camSPECS software is a powerful tool to measure the spectral sensitivity of camera systems. The
results may be used for comparison or documentation purposes and for calculating Color Correction
Matrices (CCM) and ICC profiles.
The results can be saved in plain text (.txt) or XML files. For fast documentation purposes, the resulting
plots and images can be saved to images (JPEG, PNG, TIFF, BMP, GIF).
The software allows for a validation of the measurement setup with well-known reference data (based on
ColorChecker charts) and a recalibration of the hardware with the included spectrometer.
The camSPECS software also determines the white balancing multipliers of the camera and computes
various colorimetric transform profiles.
4.1

To install camSPECS software

•
First, install the Matlab Component Runtime required for camSPECS. Execute the MCR installer (32
or 64-bit) and follow the instructions. This installer will install the Matlab Component Runtime if
necessary.
•
Then start camspecs_Vx.x.x_win64.exe or camspecs_Vx.x.x_win32.exe (depending on the Windows
operating system version) to install the camSPECS software.
4.2

RAW file conversion

camSPECS uses dcraw to convert typical camera raw images to TIFF images. There is a list of all supported
cameras at: www.cybercom.net/~dcoffin/dcraw/
Standard processing converts to linear TIFF files while retaining the CFA pattern. A dark frame subtraction
(DFS) is supported to suppress fixed pattern noise. Other supported file types are TIFF, BMP, PGM, PPM,
and PNG. dcraw can also read the EXIF data from the images, such as shutter speed, f-stop, and ISO
speed.
4.3

Workflow

This chapter describes the general workflow of spectral response measurement and evaluation.

4.3.1 Spectral sensitivity (camSPECS) module

•
Start the camSPECS software and switch to the module Spectral sensitivity (camSPECS).
•
Check the advanced settings menu to adjust the default values as needed.
•
Add the master calibration file delivered on the CD in the settings panel with the "+"-button. More
files can be added or removed from the menu using the corresponding buttons ("+," "-"). Calibration
files created during the calibration process with the software are automatically added to this menu.
•
Update all other settings as needed and add an optional dark image.
•
Select and add images with the '+' button.
Image Engineering
Page 8 of 36