low image quality when draw text on it ( c# )

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Dear Friends,

I am going to create a bitmap image and draw a text but the quality of the image for printing purpose is low and the pixels are visible and are not like when i print through microsoft word.

the following is part of the code that we use.

Please let me know if you have any solution.

Thanks

C#

MyBitmap =new System.Drawing.Bitmap(GetMaxWidthOfReport(), MyActualPageSizeInfo.Height);

MyGraphics =System.Drawing.Graphics.FromImage(MyBitmap);
			
Mygraphics.TextContrast = 4; // Default: [4], Must be between 0 - 12
Mygraphics.PageUnit = System.Drawing.GraphicsUnit.Display; // Default: [Display]
Mygraphics.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.AntiAlias; // Default: [None]
Mygraphics.PixelOffsetMode = System.Drawing.Drawing2D.PixelOffsetMode.HighQuality; // Default: [Default]
Mygraphics.CompositingMode = System.Drawing.Drawing2D.CompositingMode.SourceOver; // Default: [SourceOver]
Mygraphics.CompositingQuality = System.Drawing.Drawing2D.CompositingQuality.HighQuality; // Default: [Default]
Mygraphics.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.HighQualityBilinear; // Default: [Bilinear]

Mygraphics.TextRenderingHint = System.Drawing.Text.TextRenderingHint.ClearTypeGridFit;

Posted 30-May-12 2:23am

albert sh

Updated 30-May-12 4:13am

fjdiewornncalwe

v3

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OriginalGriff 30-May-12 8:25am

This is not a good question - we cannot work out from that little what you are trying to do.
Remember that we can't see your screen, access your HDD, or read your mind.
Show us the code you use to load the image, write on it, and try providing a link to the sample image before and after so we can see what you mean.
Use the "Improve question" widget to edit your question and provide better information.

3 solutions

Solution 1

Please see my previous solution to an analogous question here on CP: How to make high qaulity image with text in C#: Solution 1[^].

You may want to also look at this article here on CP Custom AntiAliasing with GDI+[^] by Keith Rule[^].

Regards,

Manfred

Posted 30-May-12 2:32am

Manfred Rudolf Bihy

Comments

albert sh 30-May-12 9:46am

HiThank you for your kind reply, I used antialias and also cleartypeGridfit but they made showing the words worse in the image, the following is part of the code:

MyBitmap =new System.Drawing.Bitmap(GetMaxWidthOfReport(), MyActualPageSizeInfo.Height);

MyGraphics =System.Drawing.Graphics.FromImage(MyBitmap);

Mygraphics.TextContrast = 4; // Default: [4], Must be between 0 - 12
Mygraphics.PageUnit = System.Drawing.GraphicsUnit.Display; // Default: [Display]
Mygraphics.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.AntiAlias; // Default: [None]
Mygraphics.PixelOffsetMode = System.Drawing.Drawing2D.PixelOffsetMode.HighQuality; // Default: [Default]
Mygraphics.CompositingMode = System.Drawing.Drawing2D.CompositingMode.SourceOver; // Default: [SourceOver]
Mygraphics.CompositingQuality = System.Drawing.Drawing2D.CompositingQuality.HighQuality; // Default: [Default]
Mygraphics.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.HighQualityBilinear; // Default: [Bilinear]

Mygraphics.TextRenderingHint = System.Drawing.Text.TextRenderingHint.ClearTypeGridFit;

Solution 3

You need to make the bitmap large enough, remembering that a printer will expect a higher DPI than the screen (at least 300). It probably makes more sense to draw to the printer's graphics object directly, e.g. in a PrintDocument.PrintPage event handler.

Posted 30-May-12 5:50am

BobJanova

Comments

albert sh 30-May-12 14:33pm

Thanks Bob
The problem with the printdocument is this : when the number of pages increases it will slow down,

please let me know if I use larger bitmap size how I can scale it to fit on paper?

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MuhtarQong · Accepted Answer · 2012-05-30T04:57:00

Some times changing interpolation method or AntiAlias do not changes things much.
Because they only improve the situation.

Image resolution, image size and screen resolution are related to print good quality images. Please try the following example.

1) Lets assume that your screen resolution is 96 dpi (or 72 dpi?)
2) If you want to print the image in normal quality with 5 inches-long physical sizes in each side, you should have the image size AT LEAST 5 x 96 pixels in each directions (X, Y). If you have more pixels the quality of the printed image would be better and clear.

3) First, please create larger Bitmap with higher dpi (above 96 is better). The image size, in terms of number of pixels, should be larger than the "Screen Resolution x Physical Size after printing".

(Notice "x" indicates multiplication).

Regards.

low image quality when draw text on it ( c# )

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