Added screenshots for pdf optimization (#67)

net/developer-guide/rendering-documents/rendering-to-pdf/optimization-pdf-options/optimize-content/optimization-pdf-remove-annotations.md

@@ -12,7 +12,7 @@ toc: True
 ---
 If the output PDF file contains annotations, you can remove them to reduce the file size.
 
-To remove annotations, set the `RemoveAnnotations` property to `true`.
+To remove annotations, set the [RemoveAnnotations](https://reference.groupdocs.com/viewer/net/groupdocs.viewer.options/pdfoptimizationoptions/removeannotations/) property to `true`.
 
 The following code snippet shows how to remove annotations from the file:
 
@@ -37,3 +37,7 @@ using (var viewer = new Viewer("sample.docx"))
 ```
 {{</ tab >}}
 {{</ tabs >}}
+
+The following image demonstrates the result:
+
+![Remove annotations](/viewer/net/images/developer-guide/pdf-rendering/optimization/optimization-pdf-remove-annotations.png)

net/developer-guide/rendering-documents/rendering-to-pdf/optimization-pdf-options/optimize-content/optimization-pdf-remove-fields.md

@@ -12,7 +12,7 @@ toc: True
 ---
 If the output PDF file contains form fields, you can flatten them to reduce the file size.
 
-To remove form fields, set the `RemoveFormFields` property to `true`.
+To remove form fields, set the [RemoveFormFields](https://reference.groupdocs.com/viewer/net/groupdocs.viewer.options/pdfoptimizationoptions/removeformfields) property to `true`.
 
 The following code snippet shows how to flatten form fields in the file:
 
@@ -38,3 +38,6 @@ using (var viewer = new Viewer("sample.docx"))
 {{</ tab >}}
 {{</ tabs >}}
 
+The following image demonstrates the result:
+
+![Remove fields](/viewer/net/images/developer-guide/pdf-rendering/optimization/optimization-pdf-remove-fields.png)

net/developer-guide/rendering-documents/rendering-to-pdf/optimization-pdf-options/optimize-fonts/optimization-pdf-subset-fonts.md

@@ -15,7 +15,7 @@ Fonts will be converted into subsets if set to true
 
 If the file uses embedded fonts, it contains all font data. GroupDocs.Viewer can subset embedded fonts to reduce the file size.
 
-To subset fonts in a PDF file, set the `SubsetFonts` property to `true`.
+To subset fonts in a PDF file, set the [SubsetFonts](https://reference.groupdocs.com/viewer/net/groupdocs.viewer.options/pdfoptimizationoptions/subsetfonts) property to `true`.
 
 The following code snippet shows how to subset fonts in a PDF file:
 
@@ -41,3 +41,10 @@ using (var viewer = new Viewer("sample.docx"))
 {{</ tab >}}
 {{</ tabs >}}
 
+The following image demonstrates the result. There is no difference in appearance:
+
+![No difference in appearance](/viewer/net/images/developer-guide/pdf-rendering/optimization/optimization-pdf-subset-fonts-appearance.png)
+
+But there is the significant difference in size:
+
+![Significant difference in size](/viewer/net/images/developer-guide/pdf-rendering/optimization/optimization-pdf-subset-fonts-size.png)

net/developer-guide/rendering-documents/rendering-to-pdf/optimization-pdf-options/optimize-images/optimization-pdf-convert-grayscale.md

@@ -12,7 +12,7 @@ toc: True
 ---
 To speed up the printing of a PDF file and reduce its size, you can convert it from RGB color space to grayscale.
 
-To convert a PDF file to grayscale, set the `ConvertToGrayScale` property to `true`.
+To convert a PDF file to grayscale, set the [ConvertToGrayScale](https://reference.groupdocs.com/viewer/net/groupdocs.viewer.options/pdfoptimizationoptions/converttograyscale) property to `true`.
 
 The following code snippet shows how to convert a PDF file to grayscale:
 
@@ -36,4 +36,8 @@ using (var viewer = new Viewer("sample.docx"))
 }
 ```
 {{</ tab >}}
-{{</ tabs >}}
+{{</ tabs >}}
+
+The following image demonstrates the result:
+
+![Convert to grayscale](/viewer/net/images/developer-guide/pdf-rendering/optimization/optimization-pdf-convert-grayscale.png)

net/developer-guide/rendering-documents/rendering-to-pdf/optimization-pdf-options/optimize-images/optimization-pdf-reduce-image-quality.md

@@ -13,9 +13,9 @@ toc: True
 
 If the output PDF file contains images, you can reduce its size using image compression.
 
-To enable image compression, set the `CompressImages` property to `true`. The GroupDocs.Viewer compresses all images in the file.
+To enable image compression, set the [CompressImages](https://reference.groupdocs.com/viewer/net/groupdocs.viewer.options/pdfoptimizationoptions/compressimages/) property to `true`. The GroupDocs.Viewer compresses all images in the file.
 
-The `ImageQuality` property determines the compression ratio. It is a quality value in percent. 100% means original quality.
+The [ImageQuality](https://reference.groupdocs.com/viewer/net/groupdocs.viewer.options/pdfoptimizationoptions/imagequality/) property determines the compression ratio. It is a quality value in percent. 100% means original quality.
 
 The following code snippet shows how to compress images in the file:
 
@@ -42,4 +42,6 @@ using (var viewer = new Viewer("sample.docx"))
 {{</ tab >}}
 {{</ tabs >}}
 
+The following image demonstrates the result:
 
+![Reduce image quality](/viewer/net/images/developer-guide/pdf-rendering/optimization/optimization-pdf-reduce-image-quality.png)

net/developer-guide/rendering-documents/rendering-to-pdf/optimization-pdf-options/optimize-images/optimization-pdf-set-max-resolution.md

@@ -12,7 +12,7 @@ toc: True
 ---
 If the output PDF file contains images, you can reduce its resolution.
 
-To allow changing the image resolution, set the `CompressImages` and `ResizeImages` properties to `true`. The GroupDocs.Viewer compresses all images in the file. The `MaxResolution` property determines the maximum resolution. 
+To allow changing the image resolution, set the [CompressImages](https://reference.groupdocs.com/viewer/net/groupdocs.viewer.options/pdfoptimizationoptions/compressimages/) and [ResizeImages](https://reference.groupdocs.com/viewer/net/groupdocs.viewer.options/pdfoptimizationoptions/resizeimages/) properties to `true`. The GroupDocs.Viewer compresses all images in the file. The [MaxResolution](https://reference.groupdocs.com/viewer/net/groupdocs.viewer.options/pdfoptimizationoptions/maxresolution/) property determines the maximum resolution. 
 
 The following code snippet shows how to reduce image resolution in the file:
 
@@ -39,4 +39,8 @@ using (var viewer = new Viewer("sample.docx"))
 }
 ```
 {{</ tab >}}
-{{</ tabs >}}
+{{</ tabs >}}
+
+The following image demonstrates the result:
+
+![Set max resolution](/viewer/net/images/developer-guide/pdf-rendering/optimization/optimization-pdf-set-max-resolution.png)

net/developer-guide/retrieving-document-information/get-pdf-output-file-info.md

@@ -34,4 +34,8 @@ using (Viewer viewer = new Viewer("sample.pdf"))
 }
 ```
 {{< /tab >}}
-{{< /tabs >}}
+{{< /tabs >}}
+
+The following image shows a sample console output:
+
+![](/viewer/net/images/get_pdf_output_file_info.png)