Join normal and retina images into a multi-page TIFF.

tiffjoin.py

import os

exportdir = 'new'

# Create a 'new' directory to put merged files
os.system('mkdir ' + exportdir)

# Iterate over files and combine using tiffcp
for file in os.listdir('.'):
  if file.endswith('@2x.tiff'):
    continue
  if file.endswith('.tiff'):
    filename = os.path.splitext(file)[0]
    # Take file + file@2x and create new.tiff, remove old files, rename new.tiff to original filename.tiff
    # tiffcp $file.tiff $file@2x.tiff new.tiff && rm $file.tiff && rmmv new.tiff $file.tiff
    os.system('tiffcp ' + filename + '.tiff ' + filename + '@2x.tiff new.tiff && rm ' + filename + '.tiff && rm ' + filename + '@2x.tiff && mv new.tiff ' + exportdir + '/' + filename + '.tiff')

# Move files in 'new' back to default directory
os.system('mv ' + exportdir + '/* .')

# Delete 'new' directory
os.system('rmdir ' + exportdir)

print "TIFFs joined successfully"

Instructions:

1. Export your single-page TIFFs from Sketch into a single directory. They should be named identically, like {filename}.tiff and {filename}@2x.tiff.
2. Download tiffjoin.py and place it in the export directory.
3. Open terminal.
4. Navigate to the directory with all the images using cd [drag the directory into terminal]
5. In terminal, run python tiffjoin.py
6. You should now have multi-page TIFFs.