tests: vendor sRGB.icc instead of relying on distro-specific paths

.travis.yml

@@ -13,7 +13,6 @@ matrix:
             - netpbm
             - ghostscript
             - mupdf-tools
-            - icc-profiles-free
     - name: "python 3.9 Windows"
       os: windows
       language: shell       # 'language: python' is an error on Travis CI Windows

src/img2pdf_test.py

@@ -20,6 +20,9 @@ import warnings
 import json
 import pathlib
 
+SCRIPT_DIR = pathlib.Path(__file__).resolve().parent
+ICC_PROFILE = SCRIPT_DIR / "tests" / "data" / "sRGB.icc"
+
 HAVE_MUTOOL = True
 try:
     ver = subprocess.check_output(["mutool", "-v"], stderr=subprocess.STDOUT)
@@ -304,7 +307,7 @@ def compare(im1, im2, exact, icc, cmyk):
     else:
         iccargs = []
         if icc:
-            iccargs = ["-profile", "/usr/share/color/icc/sRGB.icc"]
+            iccargs = ["-profile", ICC_PROFILE]
         psnr = subprocess.run(
             ["compare"]
             + iccargs
@@ -424,7 +427,7 @@ def compare_pdfimages_png(tmpdir, img, pdf, exact=True, icc=False):
                     "PSNR",
                     "(",
                     "-profile",
-                    "/usr/share/color/icc/ghostscript/srgb.icc",
+                    ICC_PROFILE,
                     "-depth",
                     "8",
                     str(img),