updated README content and unipdf version

unidoc · Jul 31, 2023 · fcf1f04 · fcf1f04
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diff --git a/compress/README.md b/compress/README.md
@@ -14,11 +14,14 @@ type Options struct {
 	CleanFonts                      bool
 	SubsetFonts                     bool
 	CleanContentstream              bool
+	CleanUnusedResources            bool
 }
 ```
 
+From the available filters `CleanFonts`, `CleanUnusedResources`, `CombineDuplicateStreams`, `CombineDuplicateDirectObjects`,`CombineDuplicateDirectObjects`, `CleanFonts` and `CompressStreams` enable lossless compressions.
 
 ## Examples
 
 - [pdf_optimize.go](pdf_optimize.go) compresses a PDF file with some typical options.
 - [pdf_font_subsetting.go](pdf_font_subsetting.go) illustrates how to reduce a PDF file size by subsetting all fonts used in the document using `SubsetFonts` Optimizer option.
+- [pdf_remove_unused_resources.go](pdf_remove_unused_resources.go) reduces file size by removing unused resources such as Images, Xforms, fonts and external graphics state dictionaries.
diff --git a/compress/pdf_optimize.go b/compress/pdf_optimize.go
@@ -71,6 +71,7 @@ func main() {
 		UseObjectStreams:                true,
 		ImageQuality:                    80,
 		ImageUpperPPI:                   100,
+		CleanUnusedResources:            true,
 	}))
 
 	// Create output file.

diff --git a/compress/pdf_remove_unused_resources.go b/compress/pdf_remove_unused_resources.go
@@ -1,5 +1,6 @@
 /*
  * This example shows how to use remove unused resources optimization example.
+ * The compression accomplished using this filter is lossless.
  *
  * Run as: go run pdf_remove_unused_resources.go <input.pdf> <output.pdf>
  */

diff --git a/go.mod b/go.mod
@@ -16,7 +16,7 @@ require (
 	github.com/unidoc/globalsign-dss v0.0.0-20220330092912-b69d85b63736
 	github.com/unidoc/pkcs7 v0.1.1-0.20220329190817-dd59b9eba14c
 	github.com/unidoc/unichart v0.1.0
-	github.com/unidoc/unipdf/v3 v3.46.0
+	github.com/unidoc/unipdf/v3 v3.48.0
 	github.com/wcharczuk/go-chart/v2 v2.1.0
 	go.opencensus.io v0.24.0 // indirect
 	golang.org/x/crypto v0.0.0-20220722155217-630584e8d5aa

diff --git a/go.sum b/go.sum
@@ -403,8 +403,8 @@ github.com/unidoc/timestamp v0.0.0-20200412005513-91597fd3793a h1:RLtvUhe4DsUDl6
 github.com/unidoc/timestamp v0.0.0-20200412005513-91597fd3793a/go.mod h1:j+qMWZVpZFTvDey3zxUkSgPJZEX33tDgU/QIA0IzCUw=
 github.com/unidoc/unichart v0.1.0 h1:GoJ/rxSoOYZsqlG3yOJpKkwgfsIQgb9hHX7bILZHcCg=
 github.com/unidoc/unichart v0.1.0/go.mod h1:9sJXeqxIIsU2D07tmhpDMoND0mBFRGfKBJnXZMsJnzk=
-github.com/unidoc/unipdf/v3 v3.46.0 h1:FjYaPgHPt2Guk7KeRsFnxbR9Ftp0qZsVaif0+lu8/f0=
-github.com/unidoc/unipdf/v3 v3.46.0/go.mod h1:g42g9gaGCT2hLoNK+r/RZdNVnvhF1X6qx6wpTKJwg2E=
+github.com/unidoc/unipdf/v3 v3.48.0 h1:aI/7HAvZApdpT5zJ7GlCbaNwrqhM9R1oRbNQOVrjsYI=
+github.com/unidoc/unipdf/v3 v3.48.0/go.mod h1:g42g9gaGCT2hLoNK+r/RZdNVnvhF1X6qx6wpTKJwg2E=
 github.com/unidoc/unitype v0.2.1 h1:x0jMn7pB/tNrjEVjy3Ukpxo++HOBQaTCXcTYFA6BH3w=
 github.com/unidoc/unitype v0.2.1/go.mod h1:mafyug7zYmDOusqa7G0dJV45qp4b6TDAN+pHN7ZUIBU=
 github.com/wcharczuk/go-chart/v2 v2.1.0 h1:tY2slqVQ6bN+yHSnDYwZebLQFkphK4WNrVwnt7CJZ2I=