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Visual Studio. NET built-in Crystal Reports
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Image quality
Web Viewer
Outline
The WEB program uses the Crystal Report built into Visual Studio. NET as a report development tool.
When you view a report on the WEB, the resolution of the image and the chart is reduced to DPI (for performance and download speed) by default.
How to improve the image quality of the graphic in the report?
Solution
By changing the magnification of the image in the system registry, you can improve the image quality of the graphic in the report.
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Warning:
The following decisions include editing the registry. Using Registry Editor incorrectly can cause serious problems and you may need to reload the Windows operating system. The use of the registry will be at your own risk.
It is strongly recommended that you back up the registry files (System.dat and User.dat on the Win9x computer) before you edit the registry.
To learn how to edit the registry
Read the online Help topic for Registry Editor (Regedit.exe), "Change keys and values."
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By default, the magnification setting is stored in the registry root key HKEY_CURRENT_USER and is valid only for the current logged-on user. However, when a user is authenticated by IIS through the Web, the user does not have access to the HKEY_CURRENT_USER root key.
Therefore, the magnification setting must be copied to the HKEY_LOCAL_MACHINE root key to function.
To copy the magnification setting to the HKEY_LOCAL_MACHINE root key:
1. Click Start > Run, enter "Regedit" and click OK.
2. Enter Registry Editor and navigate to the following subkey:
Hkey_current_user\software\seagate Software\crystal Reports\export
3. Right-click the "Export" subkey and choose "New" and select "Double byte value".
4. Name the item bitmapmagnifnumerator, and then double-click the item and assign the item a decimal value between 1 and 4 (4 represents the highest quality bitmap) and click OK.
5. Repeat steps 3 and 4 to create the item bitmapmagnifdenominator and assign a value of "1".
6. Select the registry subkey export, and then click the Registry menu and select Export Registry File ...
Enter the filename "export" to ensure that the selected branch radio button is selected in the export range and that the branch points to the export subkey.
7. Click Save to save the registry subkey to the desktop. Close Registry Editor.
8. Edit the registry subkey on your desktop, right-click the registry file, and select Edit. The file will open in Notepad, similar to the following:
9. Edit the file to change the default root key from HKEY_CURRENT_USER to HKEY_LOCAL_MACHINE.
To improve image quality, modify the double byte value "Bitmapmagnifnumerator" and "Bitmapmagnifdenominator". For example, you can set the molecule (Bitmapmagnifnumerator) to 3, the denominator (Bitmapmagnifdenominator) is still 1, which will improve the quality of the original 3 times times or so. The final registry subkey resembles the following:
10. After the modification, save and close the file.
11. Double-click the file Export.reg to import the new subkeys and values into the registry. IIS must be restarted for the registry changes to take effect.
By increasing the magnification of the image in the Crystal Report, you also increase the resolution and file size of all the bitmaps in the report. This will slightly reduce performance and download speed.
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Attention:
To increase the image quality of a Windows program:
1. Click Start > Run, and enter "Regedit", and then click OK.
2. Enter Registry Editor and navigate to the following subkey:
Hkey_current_user\software\seagate Software\crystal Reports\export
3. In the right pane of the registry, double-click the "Bitmapmagnifnumerator" Item and enter "3" in the Value data row.
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