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Headers for PNG image output to make sure it gets cached at browser?

I have images (PNG) that are generated dynamically and will be embedded in websites and forums. When an image gets posted on a very busy page, there are a lot many connections to service for something[详细]

2023-04-03 14:49 分类：问答
Create a PNG having JPG and AlphaChannel in C#

How can I create a PNG file if I have two separated JPG files with the image and the alpha chann开发者_开发知识库el?[详细]

2023-04-03 14:34 分类：问答
How to write binary data to a file using node.js?

I am trying to do toDataUrl() of canvas, and it gives base64 data. I want to store it as a png. I can get the converted binary datafrom base64, but I cant write it to a file using NodeJs service.[详细]

2023-04-03 08:02 分类：问答
Vertical stripes on alpha channel PNGs when scaling in Safari on iPhone/iPad

In Safari on iPhone/iPad, when I use two fingers to zoom webpages that have PNGs with an alpha channel, there are obvious rendering开发者_运维技巧s errors (vertical stripes) at certain zoom levels.[详细]

2023-04-03 07:48 分类：问答
IE8 Browser JavaScript issue

Can anyone tell me the reason why the following works in IE8 but not in Safari 5.1? <a onclick=\"j开发者_如何学运维avascript:submit();\"><img src=\"Images/Next.png\" width=\"20\" height=\"20[详细]

2023-04-02 16:39 分类：问答
How can I overlay images (png) within a website?

I am trying to mount an image in the middle of another (slightly larger) image so that it appears to be within the larger image (a phone in this case). I am unsure of the proper way to make this happe[详细]

2023-04-02 07:50 分类：问答
iOS: change png in a bar button item

I put in a tolbar a bar button item, and I set it with a png (first.png) and when I push it I want to change its png in \"second.png\"[详细]

2023-04-02 05:17 分类：问答
How to identify a NSData's image format?

If I get a NSData which I know it\'s a image\'s data.But I don\'t know what format it is. So how can I i开发者_开发技巧dentify which image format is it?Jpeg or PNG?[详细]

2023-04-02 03:58 分类：问答
Reading/preserving a PixelFormat.Format48bppRgb PNG Bitmap in .NET?

I\'ve been able to create a Format48bppRgb .PNG file (from some internal HDR data) using the the following C# code:[详细]

2023-04-02 01:41 分类：问答
Merging multiple transparent PNGs into one

I am framing ads with a curved border. Here is a sample ad: http://imageshack.us/f/20/4e5f5fe94b327new60seciq.png/[详细]

2023-04-01 15:31 分类：问答