浏览报表时，这个自定义页面通过定制相应的网址发起Web请求来调用SSRS得到报表的各页，它们是JPEG格式的96 dpi图像。
For browsing such reports, this custom page invokes SSRS through web requests by crafting appropriate urls to get individual pages of the report in JPEG format rendered using images in 96 dpi.
PHG对于网络图像来说是个极好的文件格式，因为它有一种GIF没有的典雅，支持浏览器透明度。
PNG is an excellent filetype for Internet graphics, as it supports transparency in browsers with an elegance that GIF does not possess.
你有三种选择：使用平面图像模拟的透明度，使用不能跨浏览器兼容的PNG格式，或者去折腾CSS基本的透明选择器和滤镜。
You had three choices: simulate transparency using flat images, deal with PNG's cross-browser incompatibilities, or struggle with CSS 'basic transparency selectors and filters.
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