PS文件菜单中的另存为和另存为网页格式的区别
作者 佚名技术
来源 平面设计
浏览
发布时间 2012-06-12
| your photos on the web, and your photos were shot in a color space such as Adobe RGB, it is strongly advised that you convert to sRGB first. Once you''ve done that, there is little need to include the ICC profile within the file. Comparison of JPEG Markers The differences between the output of the two JPEG compressed file saving methods is easily visible when comparing the JPEG (JFIF) files themselves. The JPEG (JFIF) file format specifies a number of mandatory markers as well as some optional ones. The chart below shows how Photoshop CS2 Save as and Photoshop CS2 Save for the Web compare at a low level, with the help of JPEGsnoop: ICC颜色配置： 另存为网页格式和另存为都提供了是否嵌入ICC颜色配置的选项。颜色配置是用来让图片文件的RGB数值在用户显示器上显示出更真实的色彩。假设你有一个经过颜色管理的环境（校准和配置过的显示器）配置能让颜色显示更接近预期的效果。 很不幸的是，大部分浏览器不支持颜色配置，并且大部分人没有校准过的显示器，所以默认假设是sRGB色彩空间。因此，如果你在网上分享照片，如果你的照片拍摄时使用的是其它色彩空间，例如Adobe RGB，那么强烈建议你转换为sRGB。如果你这样做的话，就基本不需要在文件中嵌入ICC颜色配置了。 通过对比jpeg文件，两种jpeg压缩文件保存方式的区别是很容易识别的。jpeg（jfif）文件格式中列入了一些强制的标记和一些可选的标记。下面的表格是photoshop另存为和另存为网页格式的输出文件的对比。 =============================================== Comparison of JPEG Markers in Photoshop Save As Save For Web Description SOI SOI Start of Image marker APP0 APP0 Identifier, Version, resolution, JFIF extensions APP1 EXIF data, Makernotes removed in both. (长度 5KB) APP13 Photoshop IRB (Photoshop-specific data, including quality) (长度5KB) APP1 XML metadata (EXIF, IPTC, etc.) (长度17KB) APP2* APP2* ICC color profile (* optional) (长度3KB) APP12 Ducky tag - Save for Web Quality - stores the quality level (length 17B) APP14 APP14 Encoding info: color transform (e.g. YCbCr, YCCK, RGB, CMYK) and whether or not the samples were blended (length 14B) DQT DQT Quantization Tables SOF0 SOF0 Baseline DCT, chroma subsampling DRI Restart Intervals - Adds a level of recovery in case of errors (length is variable, depends on frequency) DHT DHT Huffman compression tables SOS SOS Start of Scan: Image Data stream EOI EOI End of Image marker As can be seen in the above table, the additional data stored within a Save As JPEG versus as Save for Web JPEG is typically in the order of ~ 40 KB. In most high-resolution photos, this extra is insignificant, but when trying to compress small images for web use, this overhead could be significant. Photoshop两种保存方式输出文件的jpeg标记对比 另存为 另存为网页格式 说明 SOI SOI 图像开始标记 APP0 APP0 识别标记、版本、分辨率、jfif扩展 APP1 EXIF数据, 两种保存方式都移除了 |
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