来自BLOB字段的图像质量差 [英] Poor image quality from BLOB fields

问题描述

我正在使用Visual Studio 2005 SP1和Crystal Reports XI R2SP1。我为我的报告创建了一个数据集，其中有几个包含图像的BLOB字段。其中一个图像是National Instruments图形控件。打印报告时，所有图像的质量都低于原始图像。例如，该图显示了图和文本周围的相当多的压缩工件。我试过打开"保留原始图像颜色深度"设置对我看到的打印输出质量没有影响。似乎Crystal Reports正在压缩图像。

I am using Visual Studio 2005 SP1 along with Crystal Reports XI R2SP1.  I have created a dataset for my report which has several BLOB fields that contain images.  One of the images is of a National Instruments graph control.  All images appear to be of lower quality than the original images when I print the report.  For instance the graph shows quite a bit of compression artifacts around the plots and text.  I have tried turning on the "Retain Original Image Color Depth" setting which had no effect on the quality of the printout that I could see.  It appears that Crystal Reports is compressing the images.

是否有更好的方法在Crystal Report中打印图像？基本上我现在正在做的是拍摄图像，将它们转换为字节数组并将它们加载到数据集的BLOB字段中。然后打印报告。我曾考虑在Crystal Reports中使用图表控件，但它没有我需要的所有功能。有没有办法将NI图形控件直接复制到报告中？我可以在其他图像上使用较低的质量，但我需要图表尽可能清晰。

 Is there a better way of printing images in a Crystal Report?  Basically what I am doing now is taking the images, converting them to byte arrays and loading them into the dataset's BLOB fields.  Then printing the report.  I have thought about using the chart control in Crystal Reports but it does not have all the functionality that I require.  Is there some way to copy the NI graph control directly to the report?  I can live with lower quality on the other images, but I need the graph to be as sharp as possible.

推荐答案

可能有点晚了，但这是我的回答：我有一直在研究它...得到了一些解决方案，但没有一个按我的意愿工作，我自己做的最后一次锻炼，我们必须确保我们在Crystal Reports报告中插入的图片具有确切的大小，我的意思是它们必须完全符合我们想要的尺寸，我们必须在它们的报告中显示它们，这就是为什么质量变差。希望这有帮助。 （对不起4我的英文）

Probably kind of late, but here is my answer: I has been working on it for some days... got some solutions but none of them works as i wanted, a last I workout by myself, we have to be sure that the pictures that we insert in the Crystal Reports Report have the exact size, I mean them have to be sized exactly as we want that they be shown in our report othewise we have to scale them and thats why the quality turns poor. Hope this help.   (Sorry 4 my english)

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