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0.100000, 0.100000, 0.100000 ; K

0.243137, 0.247059, 0.584314 ; CM

0.000000, 0.658824, 0.349020 ; CY

0.066667, 0.176471, 0.215686 ; CK

0.929412, 0.196078, 0.215686 ; MY

0.215686, 0.101961, 0.141176 ; MK

0.200000, 0.196078, 0.125490 ; YK

0.266667, 0.266667, 0.274510 ; CMY

0.133333, 0.098039, 0.160784 ; CMK

0.074510, 0.180392, 0.133333 ; CYK

0.215686, 0.121569, 0.113725 ; MYK

0.125490, 0.121569, 0.121569 ; CMYK

5.9 How to Apply Isomorphic Stretching

If you have a given page size in pixel and would like to convert a PDF page to an image with exactly these given di

mensions, but the height-to-width ratio of the PDF is diﬀerent, you can apply isomorphic stretching. This is achieved

by using diﬀerent resolutions on the x and y axis. Assuming the Y-resolution is deﬁned, the X-resolution is calculated

as shown in the code sample below:

Dim conv As New PDF2IMGOCXLib.Pdf2Img

conv.Open ...

conv.CreateImage ...

For Page = 1 To conv.PageCount

conv.XDPI = conv.YDPI * conv.PageHeight / conv.PageWidth

* conv.BitmapWidth / conv.BitmapHeight

conv.RenderPage Page

conv.Close

conv.CloseImage

5.10 Dithering

Dithering is a common means used in images to simulate colors that are not available as actual colors. Its use is best

observed in image with a low color depth, where colors or shades of grey need to simulated with other colors (e.g.

only black/white pixels).

5.10.1 Remarks

1. All images below have quite a low resolution. As a result the eﬀects of the diﬀerent dithering types become

more obvious. The higher the resolution and the large the number of colors is, the higher the quality of the

image.

2. The rendering ﬁlter and current zoom level of the PDF viewing application may have an additional impact on

how the images below are displayed.

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5.10.2 Color Images

Color Space

RGB (24 bit)

Dithering

None

File Size as PNG 129 kB

Highest quality

Highest ﬁle size

A 24 bit RGB color image can have up to 16.7 millions of diﬀerent colors. Dithering does not need to be applied

since all required colors exist and none need to be simulated.

Color Space

16 colors (4 bit)

Dithering

None

File Size as PNG 16 kB

Small ﬁle size

Works well for images

with a small number of

colors (artiﬁcial images,

text)

Does not work well for

images with lots of colors

photographic images) -

parts of the image can

become plain-colored

and details get lost

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Color Space

16 colors (4 bit)

Dithering

Floyd-Steinberg

File Size as PNG 18 kB

Renders details better

Usually better overall

quality, especially in

photographic images

than without dithering

Sometimes generates

unwanted artifacts

(striking pixels)

Larger ﬁle size then

without dithering

5.10.3 Bi-tonal Images

(The 8 bit image just acts as reference.)

Color Space

Grayscale (8 bit)

Dithering

None

File Size as PNG 46 kB

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Color Space

Grayscale (1 bit)

Dithering

None

File Size as PNG 2.6 kB

Smallest File Size

Works well for

documents with high

contrast (black text on

white background)

Does not generate

artifacts

Details get lost, because

shades of gray are not

approximated, but

converted to either black

or white (in fact images

or part of them can

become completely

black or white)

Color Space

Grayscale (1 bit)

Dithering

Floyd-Steinberg

File Size as PNG 9 kB

Generally higher quality,

specially of photographic

images

Can approximate any

shade of gray

Larger ﬁle size than

without dithering

Generates artifacts (e.g.

a very bright gray paper

is approximated by

far-spread single black

pixels)

Not well suited for text,

unless the color of the

text must be reﬂected

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Color Space

Grayscale (1 bit)

Dithering

Halftone

File Size as PNG 4 kB

Small ﬁle size

Approximates shades of

gray

Not well suited for text or

artiﬁcial images

Color Space

Grayscale (1 bit)

Dithering

Pattern

File Size as PNG 5 kB

Works acceptable for all

types of content (text,

photographic images,

artiﬁcial images)

Is not excellent in any

type of content

5.10.4 Guidelines

As seen in the examples above, diﬀerent types of dithering behave diﬀerent for diﬀerent types of content. Below

are some suggestions, which dithering type is normally best for a give type of content:

Text, OCR No dithering

Artiﬁcial images with few colors and no bright colors No dithering

Artiﬁcial images with many colors Test which dithering type yields the best result

Photographic images Floyd-Steinberg

Mixed content Test which dithering type yields the best result

Mixed content, high-resolution

For resolutions above 300 dpi, Floyd-Steinberg almost always yields the best

result (exception: for pure black text on white background, use no dithering)

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Keep in mind that dithering should only be applied for images with a low color depth, such as black and white (1

bit). Dithering for images with a color depth of 8 bit or higher (256 colors or grey scale) has little to no visual impact.

6Programmer’s Reference

Note: This manual describes the COM interface only. Other interfaces (C, Java,

.NET) however work similarly, i.e. they have calls with similar names and the call

sequence to be used is the same as with COM.

6.1

PdfToImg

Interface

This interface is included in the

Pdf2ImgOCX.dll

This interface takes a PDF document as input and creates a raster image (e.g. a TIFF) as output.

6.1.1

BilevelThreshold

Property (get, set):

Long BilevelThreshold

Default:

181

Get or set the threshold for the conversation from gray to bi-tonal when Dithering is

eDitherNone

. Value must

be in the range of

255

6.1.2

BitmapHeight

Property (get):

Long BitmapHeight

Return the height of the bitmap in pixel.

6.1.3

BitmapWidth

Property (get):

Long BitmapWidth

Return the width of the bitmap in pixel.

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6.1.4

BitsPerPixel

Property (get, set):

Integer BitsPerPixel

Default:

Get or set the color depth. Bi-tonal:

, gray scale:

, RGB true color:

, CMYK:

When using 1 bit per pixel, it is suggested to disable anti-aliasing (disable

eOptionHighQuality

) and set a suit

able dithering algorithm (property

Dithering

6.1.5

Center

Property (get, set):

Boolean Center

Default:

False

Set or get the center mode. When set to

True

, the document is horizontally and vertically centered on the page.

When set to

False

, the document is printed to the upper left corner of the page.

6.1.6

Method:

Boolean Close()

Close an opened input ﬁle. If the document is already closed the method does nothing.

Returns:

True

The ﬁle was closed successfully.

False

Otherwise.

6.1.7

CloseImage

Method:

Boolean CloseImage()

Close an open image document. If the document is already closed the method does nothing.

Returns:

True

The image ﬁle could successfully be closed.

False

Otherwise.

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6.1.8

ColorSpace

Property (get, set):

TPDFColorSpace ColorSpace

Default:

eColorRGB

Get or set color space of the output image, see enumeration

TPDFColorSpace

For black white bi-tonal images, a gray color space must be selected.

6.1.9

Compression

Property (get, set):

TPDFCompression Compression

Default:

eComprRaw

Get or set the compression type of TIFF images. For any other image format, the compression is automatically

deﬁned by the ﬁle extension (the ﬁle name).

The supported values for

TPDFCompression

are listed in the corresponding enumeration.

6.1.10

ConvertFile

Method:

Boolean ConvertFile(String PDFFileName, String g ImageFileName, String

Password)

Convert a complete PDF ﬁle to a

Parameters:

PDFFileName [String]

ImageFileName [String]

Password [String]

The user or the owner password of the encrypted PDF document. If this parameter is

left out an empty string is used as a default.

Returns:

True

The ﬁle was converted successfully.

False

The PDF ﬁle does not exists, it is corrupt, the password is invalid, or the image ﬁle is locked.

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6.1.11

CreateImage

Method:

Boolean CreateImage(String g FileName)

Create a new image ﬁle.

Parameter:

FileName [String]

The ﬁle name and optionally the ﬁle path, drive or server string according to the op

erating systems ﬁle name speciﬁcation rules. The ﬁle name deﬁnes the image format. Supported extensions

are:

.bmp

(Windows Bitmap Format)

.gif

(Graphics Interchange Format)

.jb2

(JBIG2, Bi-level Images)

.jpg

.jpeg

(Joint Photographic Experts Group)

.jp2

(JPEG2000)

.jpf

.jpx

(JPEG2000, Part 2 - Coding Extensions)

.png

(Portable Network Graphics)

.tif

.tiff

(Tagged Image File Format)

Returns:

True

The ﬁle could successfully be created.

False

Otherwise.

6.1.12

CreateImageInMemory

Method:

Boolean CreateImageInMemory(String g Extension)

Save an image in memory as a byte array. See also method

GetImage

Parameter:

Extension [String]

The name of the extension. For a list of supported extensions see method

CreateIm-

age

. The leading“.” needs to be included.

Returns:

True

The image could successfully be created.

False

Otherwise.

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6.1.13

Dithering

Property (get, set):

TPDFDithering Dithering

Default:

eDitherFloydSteinberg

Get or set the dithering algorithm. Dithering refers to the procedure of simulating colors or grayscales. This is mainly

useful for low color depth (e.g. black and white or indexed) images.

The supported values for

TPDFDithering

listed in the corresponding enumeration. For more information see

chaptherDithering

6.1.14

DPI

Property (get, set):

Single DPI

Default:

150

Get or set the resolution of the image in DPI (dots per inch).

Set Both the resolutions for the x- and y-axis are set to the same value.

Get Return the square root of the product of x and y.

Setting DPI is redundant to setting the specialized properties

XDPI

and

YDPI

6.1.15

ErrorCode

Property (get):

TPDFErrorCode ErrorCode

This property can be accessed to receive the latest error code. See also enumeration

TPDFErrorCode

. PDF-Tools

error codes are listed in the header ﬁle

bseerror.h

. Please note that only few of them are relevant for the 3-

Heights™ PDF to Image Converter API.

6.1.16

FaxHSetting

FaxSSetting

Method:

Boolean FaxHSetting()

Method:

Boolean FaxSSetting()

These two methods set the TIFF Type F settings, which is equal to RotateMode =

RotatePortrait

Set-

BitmapDimensions(1728, 0)

, XDPI =

204

, YDPI =

196

(Fax H)/98(Fax S)

, Compression =

eCom-

prGroup3

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