[tc10160]

有没有达人了解这个device-link profile的？

[xxyyzz97]

Device link profiles are an official ICC profile type and are used to concatenate together a series of profiles and their settings.
Device link profiles convert directly from one device color space (i.e. CMYK, RGB)
to a different device color space without the use of a profile connection space (XYZ
or L*a*b*). This is in contrast to an ICC device profile which converts from a color
space to the profile connection space (PCS) and from the PCS to a color space.
Device link profiles describe a unidirectional conversion instead of the color characteristics of a device.
Device link profiles concatenate a series of device profiles and their settings, including rendering intent; therefore only one device link profile is need for a conversion in contrast to the minimum of two profiles that are needed for a conversion using device profiles.

[wwwprint]

对楼上帖子做如下理解：
device-link profile是一种设备——设备的连接转换方式，与一般转换方式“rgb-lab-cmyk”不同，他可以是直接进行“RGB-CMYK或CMYK-RGB”转换，而只能是单向的转换。
+++++++++++++++++++++++++++++++++++

由于它是设备到设备的对应，针对性强，转化效果较好，但是也正是这一原因，他需要建立众多设备间的一一对应关系，要做很多device-link profile，没有“rgb-lab-cmyk”这样的转换方式应用方便。

[xxyyzz97]

作者: wwwprint

对楼上帖子做如下理解：
device-link profile是一种设备——设备的连接转换方式，与一般转换方式“rgb-lab-cmyk”不同，他可以是直接进行“RGB-CMYK或CMYK-RGB”转换，而只能是单向的转换。
+++++++++++++++++++++++++++++++++++

由于它是设备到设备的对应，针对性强，转化效果较好，但是也正是这一原因，他需要建立众多设备间的一一对应关系，要做很多device-link profile，没有“rgb-lab-cmyk”这样的转换方式应用方便。

Device-link profile need to have a program to do the conversion. In themarket, there are many, such as Alwan Color Expertise LinkProfiler, CGS Ink Optimizer, Chromix ColorThink, GMG Color Sever, Compose InkScript Optimizer, GretagMacbeth ProfileMaker, Heidelberg PrintOpen, etc are program for conversion.
One use of device link profiles is in the printing industry where it is necessary to
repurpose a CMYK image file from its original destination color space to output to a
different destination CMYK color space. For example, images may have been
separated for SWOP CMYK but may need to be converted to the CMYK color space
for the press actually being used (such as Fogra 39L) or other device such as Color laser printer, inkjet proofer, etc.
Direct CMYK-to-CMYK color transformation provided by device link profiles can produce accurate color and make for an efficient color production workflow.
As device link profiles do not use the PCS they provide better control over the
transformation in a CMYK to CMYK color conversion.

[bonafide1978]

device link 是干吗的？

我不知道 device link 是不是CMYK-RGB，印象里好像没有。只有CMYK -CMYK的。

之所以有device link 是因为是连接两个相类似的设备但具有不同的设备状况，icc. 但普通的色彩管理例如绝对色度转变不就可以了。其实这里面有一个问题就是K. 如果 CMYK 到LAB 再到CMYK的时候，K的值是会被 改变的, 或者说很多时候K 会变成CMYK. 这个时候 device link 就有用了。

其实简单地说，device link 就是在保留原来K通道下做色彩管理罢了。例如，从你的印刷机的icc 到你的数码打样设备的icc。device link 是最好的色彩转移途径了。

[tc10160]

大家有没有知道其中具体的转换原理，颜色是如何在不同设备的色域范围里对应的啊

[shyanjl]

色域对应应该还是通过LAB值的，好处就是可以保持黑版、保持纯色，但应用范围比较有限了。