Adobe Photoshop 6.0 文件格式详解

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“Adobe Photoshop 文件格式规范6.0版” 在图像编辑和数字艺术的世界中，Adobe Photoshop 是一个不可或缺的名字，其文件格式对于任何涉及到图像处理的专业人士或爱好者来说都至关重要。Photoshop 文件格式，通常以 .PSD 作为扩展名，是Adobe公司的专有格式，它能够保存图像的所有层、通道、蒙版、调整、文本等详细信息，为后期编辑提供了极大的灵活性。此文档——“Adobe Photoshop File Formats Specification”——是Adobe Systems Incorporated发布的，详细介绍了Photoshop 6.0版本的文件结构和内部工作原理。这份文档涵盖了从基本的文件头信息到复杂的图层管理、色彩模式、透明度和Alpha通道、3D对象、元数据等多个方面的内容。 1. **文件头信息**：每个Photoshop文件开始时包含一个文件头，用于标识文件类型和版本，确保软件能正确解读文件内容。 2. **图层和蒙版**：Photoshop文件允许存储多个图层，每个图层可以有自己的透明度、混合模式和效果。此外，蒙版功能允许用户不破坏原始图像的情况下进行遮罩和隐藏操作。 3. **通道**：除了颜色通道外，Photoshop还支持Alpha通道，用于表示图像的透明度信息。通道可以单独编辑，提供了创建复杂选择区域的高级方法。 4. **色彩模式**：Photoshop支持多种色彩模式，包括RGB、CMYK、灰度、索引颜色等，适应不同的打印和屏幕显示需求。 5. **文本层**：文件可以包含可编辑的文本，保留原始字体信息和排版样式。 6. **3D集成**：自某些版本起，Photoshop支持集成3D对象，允许用户在2D图像中添加立体元素。 7. **元数据**：文件可以包含关于图像的元数据，如作者、版权信息、相机设置、Exif数据等，这对于管理和追踪图像历史非常有用。 8. **压缩和效率**：Photoshop文件可以被压缩以减小文件大小，同时保持图像质量，这有助于存储和传输。 9. **版本兼容性**：尽管此文档是针对Photoshop 6.0的，但理解文件结构对于了解后续版本的更新和改进也是至关重要的。 10. **版权和许可**：文档明确指出，Adobe对提供的信息不承担任何错误或不准确性的责任，软件的使用和复制应遵循许可证条款。这个规范对于开发者、插件制作者以及深入研究Photoshop操作的人来说是一份宝贵的资源，它揭示了Photoshop文件背后的工作机制，帮助用户更好地理解和利用这种强大的图像处理工具。

2. Document File Formats

Adobe Photoshop File Formats Specification

Path resource format

Photoshop stores the paths saved with an image in an image resource block.

These resource blocks consist of a series of 26 byte path point records, and so

the resource length should always be a multiple of 26.

Photoshop stores its paths as resources of type 8BIM with IDs in the range

2000 through 2999. These numbers should be reserved for Photoshop. The

name of the resource is the name given to the path when it was saved.

If the file contains a resource of type 8BIM with an ID of 2999, then this

resource contains a Pascal–style string containing the name of the clipping

path to use with this image when saving it as an EPS file.

The path format returned by GetProperty() call is identical to what is

described below. Refer to the IllustratorExport sample plug–in code to

see how this resource data is constructed.

Path points

All points used in defining a path are stored in eight bytes as a pair of 32–bit

components, vertical component first.

The two components are signed, fixed point numbers with 8 bits before the

binary point and 24 bits after the binary point. Three guard bits are reserved

in the points to eliminate most concerns over arithmetic overflow. Hence,

the range for each component is 0xF0000000 to 0x0FFFFFFF representing a

range of –16 to 16. The lower bound is included, but not the upper bound.

This limited range is used because the points are expressed relative to the

image size. The vertical component is given with respect to the image

height, and the horizontal component is given with respect to the image

width. [0,0] represents the top–left corner of the image; [1,1]

([0x01000000,0x01000000]) represents the bottom–right.

In Windows, the byte order of the path point components are reversed; you

should swap the bytes when accessing each 32–bit value.

Path records

The data in a path resource consists of one or more 26-byte records. The first

two bytes of each record is a selector to indicate what kind of path it is. For

Windows, you should swap the bytes before accessing it as a short.

Table 2–8: Path data record types

Selector Description

0 Closed subpath length record

1 Closed subpath Bezier knot, linked

2 Closed subpath Bezier knot, unlinked

3 Open subpath length record

4 Open subpath Bezier knot, linked

5 Open subpath Bezier knot, unlinked

6 Path ﬁll rule record

7 Clipboard record

8 Initial ﬁll rule record

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