CkPython Requires Chilkat v11.7.0+

Deflate Compression Level When Optimizing a PDF

See more PDF Optimization Examples

Demonstrates compressionLevel, which is the deflate level (1 to 9, 9 by default) used for every stream the optimizer re-encodes. Level 9 is the smallest and the slowest; level 1 is the quickest. The difference is usually a percent or two, so level 9 is the right default for a file that will be downloaded many times, and a lower level is worth considering only when a server optimizes PDFs on the fly. A value outside 1 to 9 is an error. CkPython

import sys
import chilkat

success = False

#  This example requires the Chilkat API to have been previously unlocked.
#  See Global Unlock Sample for sample code.

#  The PDF used in this example is available at watersense_accomplishments.pdf

fac = chilkat.CkFileAccess()
json = chilkat.CkJsonObject()
jsonOut = chilkat.CkJsonObject()

pdf1 = chilkat.CkPdf()
success = pdf1.LoadFile("qa_data/pdf/watersense_accomplishments.pdf")
if (success == False):
    print(pdf1.lastErrorText())
    sys.exit()

json.UpdateInt("compressionLevel",1)
success = pdf1.Optimize("optimize",json,jsonOut)
if (success == False):
    print(pdf1.lastErrorText())
    sys.exit()

success = pdf1.WriteFile("qa_output/watersense_level1.pdf")
if (success == False):
    print(pdf1.lastErrorText())
    sys.exit()

print("level 1: " + str(fac.FileSize("qa_output/watersense_level1.pdf")))

pdf9 = chilkat.CkPdf()
success = pdf9.LoadFile("qa_data/pdf/watersense_accomplishments.pdf")
if (success == False):
    print(pdf9.lastErrorText())
    sys.exit()

json.UpdateInt("compressionLevel",9)
success = pdf9.Optimize("optimize",json,jsonOut)
if (success == False):
    print(pdf9.lastErrorText())
    sys.exit()

success = pdf9.WriteFile("qa_output/watersense_level9.pdf")
if (success == False):
    print(pdf9.lastErrorText())
    sys.exit()

print("level 9: " + str(fac.FileSize("qa_output/watersense_level9.pdf")))

#  A level outside 1..9 fails, and LastErrorText says why.
pdfBad = chilkat.CkPdf()
success = pdfBad.LoadFile("qa_data/pdf/watersense_accomplishments.pdf")
if (success == False):
    print(pdfBad.lastErrorText())
    sys.exit()

json.UpdateInt("compressionLevel",12)
success = pdfBad.Optimize("optimize",json,jsonOut)
if (success == False):
    print("compressionLevel 12 was refused, as it should be.")