how to make a transparent picture

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	how to make a transparent picture

xiawinter

3-3-2007 4:53 AM

1580 views

tags:

transparent background, authorware, powerpoint, flash

xiawinter says:

It's very common to put a picture with transparent background in a slides, but Jpeg and bmp file don't save this kind of information. Gif save the information, however, it only saves 256 colors. png is the best file to save transparent information

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<div style="margin: 12px 0px; font-family: arial; color: #333333; background: #ffffff; border: solid 4px #e5e5e5; width: 100%; clear: left;"><div class="CM_CTB_Content_Wrap" style="margin: 0px; padding: 0px;background-color: #ffffff;"><div style="border-bottom: solid 1px #dcdcdc; white-space: nowrap; margin-bottom: 8px; background-color: #eeeeee ;background-image: url(http://clipmarks.com/images/source-bg.gif); background-repeat: repeat-x; height: 24px; line-height: 24px; vertical-align: middle; padding-bottom: 4px; color: #666666; font-size: 10px;" ><a href="http://clipmarks.com/clip-to-blog/" title="see clips that are hot right now"><img src="http://content.clipmarks.com/blog_embed/3bb0a188-aee6-47bf-8040-4dc2f7c14e63/E54287B7-F59D-4ED8-B906-D75B179B234E/" alt="" width="19" height="19" border="0" style="vertical-align: middle; margin: 0px 4px; display: inline; border: none; float:none;" /></a>clipped from <a title="http://www.jcwcn.com/html/Authorware/02_09_06_61.htm" href="http://www.jcwcn.com/html/Authorware/02_09_06_61.htm" style="font-size: 11px;">www.jcwcn.com</a></div><blockquote style="text-align: left; padding: 0px 8px; margin: 4px 0px 8px 0px; background: transparent; border: none;" cite="http://www.jcwcn.com/html/Authorware/02_09_06_61.htm"><H3>Authorware实现图片背景透明</H3></blockquote><div style="height: 2px; font-size: 2px; background: #dcdcdc; border-bottom: solid 1px #f5f5f5; margin: 2px 4px;"></div><blockquote style="text-align: left; padding: 0px 8px; margin: 4px 0px 8px 0px; background: transparent; border: none;" cite="http://www.jcwcn.com/html/Authorware/02_09_06_61.htm"><DIV>　　在回答这个问题之前，我们简单地说明一下哪些图片格式可以保存透明信息。在我们常用图片的格式中，像BMP、JPG格式的图片是不能保存透明信息的。GIF格式的图片可以保存透明信息，但GIF格式的图片最多只能有256种颜色，因而只能使用在对图片要求不高的场合。比较理想的是图片处理软件Photoshop的图片格式PSD，但以上三种常用课件制作软件中，只有Authorware可以支持PSD格式，而另外两种均不支持。所以今天我们这里要介绍另外一种格式：PNG格式，PNG格式的图片支持无损压缩<FONT color="#0000ff"></FONT>，而且可以很好地保存透明信息，最重要的一点是，以上三种软件都可以支持该格式。下面我们就来看一下，如何利用Photoshop输出带有透明信息的PNG格式的图片。 </DIV></blockquote><div style="height: 2px; font-size: 2px; background: #dcdcdc; border-bottom: solid 1px #f5f5f5; margin: 2px 4px;"></div><blockquote style="text-align: left; padding: 0px 8px; margin: 4px 0px 8px 0px; background: transparent; border: none;" cite="http://www.jcwcn.com/html/Authorware/02_09_06_61.htm"><P>　　　　　　　　　　　　　　　                        <BR /><DIV>　　最后，我们要把它输出为PNG格式文件，单击“文件/存储为Web所用格式…”，在右侧的保存选项中选择“PNG—24”格式，把下面的“透明区域”选项选上，单击[好]保存。 </DIV><BR />　　现在，就可以在上述的三个课件制作软件中把PNG格式的图片导入了，图6是在三种软件中导入图片的最终效果。注意，在Authorware中，选择透明方式时必须选择“阿尔法”模式，PowerPoint和<A target="_blank" href="http://www.jcwcn.com/html/Flash">Flash</A>导入后无须进行任何设置。</P></blockquote></div><div style="margin: 0px 6px 6px 4px;"><table style="font-size: 11px;border-spacing: 0px;padding: 0px;" cellpadding="0" cellspacing="0" width="100%"><tr><td style="background:transparent;border-width:0px;padding:0px;">&nbsp;</td><td align="right" style="background:transparent;border-width:0px;padding:0px;width:107px" width="107"><a href="http://clipmarks.com/share/E54287B7-F59D-4ED8-B906-D75B179B234E/blog/" title="blog or email this clip"><img src="http://content9.clipmarks.com/images/c2b-foot.png" border="0" alt="blog it" width="107" height="17" style="border-width:0px;padding:0px;margin:0px;" /></a></td></tr></table></div></div>

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