References of dialog boxes

separate plug-in

Separate dialog

Source colorspace

Choose the ICC profile that represents the color space of the source image. Turn on the check box if a profile is embedded.

If you perform color separation with a devicelink profile, specify the devicelink profile here.

Destination colorspace

Select an ICC profile that represents the color space of printed matter. A different profile is provided for different printing condition, so choose the most appropriate one. (The printing condition will be described in the document attached to the profile or web pages of the distributor.) If you are not sure, contact your printing company or profile provider.

If you perform color separation with a devicelink profile, assign the profile to attach to the result here. (You can also choose no profile to attach.) This profile is referred only when proof or export and it does not affect the processing of color separation.

Rendering intent

See guidebooks about color management. Generally, select either "Perceptual" or "Relative colorimetric" (the final decision should be done after the result)*1.

Use BPC algorithm

Refer to guidebooks about color management. Unless you have any reason, keep this option on at any time.

Use devicelink profile

Choose it when you perform color separation with a devicelink profile. The choice of the profile is done at Devicelink profile list box, which Source color space list box turns into.

Caution:Those who do not understand devicelink profile should not choose it.

Preserve pure black

It replaces pixels of RGB=0,0,0 with CMYK=0%,0%,0%,100%.

Overprint pure black

For the pixels of RGB=0,0,0, it replaces K values with 100%.(CMY values are almost the same as regular converting results.)

Use dither*2

It approximates pixels whose conversion result value cannot be expressed by an 8-bit integer with dithering. When gradation with banding is generated, use dithering and the problem may be remediated.

Make CMYK pseudo-composite

Usually, separating results are output in the form of grayscale layer, but selecting this option allows to output colored layer. Use this option when it is convenient for you to check images by layering 4 images such as when modification or minute adjustment is needed after the separation.

Proof dialog

Monitor colorspace

Choose the ICC profile of your monitor.

If the monitor profile is unknown or lacking, choose Adobe RGB (for a wide gamut monitor) or sRGB (for a conventional monitor or a monitor used in sRGB mode) as a substitution. However, note that the use of the substitution profile for performing a proof is less reliable than the use of an appropriate monitor profile.

Separated image's colorspace

Select a profile assigned at "Destination color space" when the image was separated. Normally, choosing "Give priority to attached profile" will make no problem.

Mode

Refer to guidebooks explained about color settings in Adobe Photoshop. If you check images only on a monitor, leave "Normal". When it is compared with the printed version in appropriate viewing condition, the choice of "Simulate media white" may be appropriate.

Export dialog

Format

Choose TIFF, JPEG or Photoshop PSD. If you choose "Auto", the format is determined from the extension of the file name. If the determination is unavailable or the extension of the file name is for unsupported file format, TIFF is selected.

Compress pixel data

It compresses pixel data. TIFF images are compressed by LZW algorithm, and Photoshop PSD images are compressed by PackBits.

In case of JPEG images, when this option is turned on, compressibility is preceded and this option is turned off, image quality is preceded (It does not mean to generate uncompressed files).

Clipping path

When a separated image is exported to a file, all of the paths are included in the file. From them, assign a path for the clipping path here. You can choose "Don't specify" if you plan to assign any clipping path after image placement by a layout application.

Embed color profile

Choose whether or not a color profile is embedded in an exported file. Profiles which color management preferences specify or which you used for the color separation are selectable.

icc_colorspace plug-in

Assign colorspace dialog

Current colorspace

Profiles assigned to the image are displayed.

New colorspace

Specify a profile you would like to assign to the image newly. Selectable profiles are RGB Input, Output and Display device profile. To remove the profile of current assignment, choose "Unassign colorspace".

Convert colorspace dialog

Source colorspace

Profiles assigned to the image are displayed.

Rendering intent

Choose a mapping method from the source color space to the destination color space. Generally, you may use "Perceptual" or "Relative colorimetric"*1.

For more information, see guidebooks of color management.

Use BPC algorithm

When "Relative colorimetric" is selected for the rendering intent, it maps the black of source color space onto the black of destination color space.

For more information, see guidebooks of color management.

Destination colorspace

Assign a profile of the destination color space. Assignable profiles are RGB display and output profiles.

Use dither※2

It approximates pixels whose conversion result value cannot be expressed by an 8-bit integer with dithering. When gradation with banding is generated, use dithering and the problem may be remediated.

Flatten image

Fundamentally, with the layer mode, each layer is basically processed based on their RGB values, rather than the apparent color. Consequently, the conversion of color spaces will modify pixel values of each layer and affect the layer projection.

If you choose "Flatten image", all layers are flattened before the conversion and the effect mentioned above can be lessened (however, of course, the layers are lost).

Apply abstract profile dialog

Abstract profile

Choose Abstract profile you use.

Target

Choose a target for the effect of abstract profiles. As for "Selection", the target is within the selection of active layer. As for other two, the target is the whole area regardless of the presence or absence of the selection.

Rendering intent/Use BPC algorithm

Choose a method of gamut mapping in the convert between the color space of an image and PCS (Lab or XYZ space).

For more information, see guidebooks of color management.

Use dither*2

It approximates pixels whose conversion result value cannot be expressed by an 8-bit integer with dithering. When gradation with banding is generated, use dithering and the problem may be remediated.

Notes

  1. Absolute colorimetric (2) makes the results much like to results of "Absolute colorimetric" at Photoshop CS2 or later. If you perform a regular transformation followed by an ICC specification, do not choose this option.
  2. This option depends on a function implemented in Little CMS 1.18 or later. When you run the plug-in with runtime libraries of 1.17 or earlier, the effect is not provided even if dithering is set to use.

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Yoshinori Yamakawa <yamma-ma at users.sourceforge.jp>