Modify: documentation and usage info

[ChrisCoxArt]

Fix spelling, bad characters, etc.
Improve usage information in some apps.
Remove obsolete build instructions
Remove obsolete (and incomplete) README.txt
Make more of the documentation match the code.
Fixes #186 #187

Pull Request Checklist

• Have you followed the guidelines in Contributing document?
• Have you checked to ensure there aren't other open Pull Requests for the same change?
• Have you built your Pull Request locally with the Build Instructions?
• Have you added or updated relevant tests?
• Have you added or updated relevant docs?

[xsscx]

Maintainer Repro

Wed Jan 7 01:04:16 AM UTC 2026

Get PR455

git clone https://github.com/InternationalColorConsortium/iccDEV.git
cd iccDEV/Build
git fetch origin pull/455/head:pr-455
git checkout pr-455
git rev-parse HEAD && git show --no-patch --oneline
         cmake -DCMAKE_EXPORT_COMPILE_COMMANDS=ON -DCMAKE_INSTALL_PREFIX="$HOME/.local" -DCMAKE_BUILD_TYPE=Debug -Wno-dev -DCMAKE_CXX_FLAGS="-g -fsanitize=address,undefined -fno-sanitize=leak -fno-omit-frame-pointer -Wall" -DENABLE_TOOLS=ON -DENABLE_STATIC_LIBS=ON -DENABLE_SHARED_LIBS=ON Cmake > cmake.log 2>&1
make -j32
        cd ../Testing/
        echo "=== Updating PATH ==="
         for d in ../Build/Tools/*; do
          [ -d "$d" ] && export PATH="$(realpath "$d"):$PATH"
         done

Expected Output

git rev-parse HEAD && git show --no-patch --oneline

95a0465
95a0465 (HEAD -> pr-455, origin/issue-187) more updates for documentation of command line apps

iccApplySearch

Usage 1: iccApplySearch -cfg config_file_path
  Where config_file_path is a json formatted ICC profile application configuration file

Usage 2: iccApplySearch {-debugcalc} data_file_path encoding[:precision[:digits]] interpolation {-ENV:tag value} profile1_path intent1 {{-ENV:tag value} middle_profile_path mid_intent} {-ENV:tag value} profile2_path intent2 -INIT init_intent2 {pcc_path1 weight1 ...}
Built with IccProfLib version 2.3.1.2

  For final_data_encoding:
    0 - icEncodeValue (converts to/from lab encoding when samples=3)
    1 - icEncodePercent
    2 - icEncodeUnitFloat (may clip to 0.0 to 1.0)
    3 - icEncodeFloat
    4 - icEncode8Bit
    5 - icEncode16Bit
    6 - icEncode16BitV2

  FmtPrecision - formatting for # of digits after decimal (default=4)
  FmtDigits - formatting for total # of digits (default=5+FmtPrecision)

  For interpolation:
    0 - Linear
    1 - Tetrahedral

  For init_intent/intent1/intent2/mid_intent:
     0 - Perceptual
     1 - Relative
     2 - Saturation
     3 - Absolute
     10 + Intent - without D2Bx/B2Dx
     40 + Intent - with BPC
     90 + Intent - Colorimetric Only
    100 + Intent - Spectral Only
 +10000 - Use V5 sub-profile if present

iccV5DspObsToV4Dsp

Usage: iccV5DspObsToV4Dsp inputV5.icc inputObserverV5.icc outputV4.icc
Convert an ICCVersion5 display and observer to ICCVersion4 display profile,
allowing version5 profiles to be used by legacy applications.
        inputV5.icc: input version5 display profile
        inputObserverV5.icc: input version5 observer profile
        outputV4.icc: output version4 display profile
Built with IccProfLib version 2.3.1.2