Use ICC/ICM for monitor viewing

Select this option if you want IDimager to use color management when opening images in the Image Viewer. Selecting this option also allows you to use color management once you want to publish images to the web or you want to create slide shows.

Use ICC/ICM to create previews and/or thumbnails

Select this option if you find it important that your previews and thumbnails are generated with your monitor color profile.

Input Profile

The input profile is generally ignored for images that also contain en embedded color profile or which are tagged with the correct profile. The Input profile is *only* used when no other profile information can be determined based for the image. You'd typically leave this at the sRGB profile as images without color information are typically treated as sRGB images.

Monitor Profile

This is where you select your own monitor profile (or printer profile for the Printer Settings tab). The monitor profile contains a calibrated color definition which is specific for your monitor. A monitor profile can be created using calibration software (like Adobe GammaTM) or by using monitor calibration hardware (like a Color SpiderTM).

Rendering intent

Taken from LMCS documentation:

It's out of scope of this document to define the exact meaning of rendering intents. I will try to make a quick explanation here, but often the meaning of intents depends on the profile manufacturer.

Perceptual:

Hue hopefully maintained (but not required), lightness and saturation sacrificed to maintain the perceived color. White point changed to result in neutral grays. Intended for images.

Relative Colorimetric:

Within and outside gamut; same as Absolute Colorimetric. White point changed to result in neutral grays.

Saturation:

Hue and saturation maintained with lightness sacrificed to maintain saturation. White point changed to result in neutral grays. Intended for business graphics (make it colorful charts, graphs, overheads, ...)

Absolute Colorimetric:

Within the destination device gamut; hue, lightness and saturation are maintained. Outside the gamut; hue and lightness are maintained, saturation is sacrificed. White point for source and destination; unchanged. Intended for spot colors (Pantone, TruMatch, logo colors, ...)

Not all profiles do support all intents. If you specify an intent that the profile doesn't handle, lcms will select default intent instead. Usually perceptual. This will force to "look nice", no matter the intent is not the one really desired.

Black point compensation

The black point compensation feature does work in conjunction with relative colorimetric intent. Perceptual intent should make no difference, although it affects some profiles.

The mechanics are simple. BPC does scale full image across gray axis in order to accommodate the darkest tone origin media can render to darkest tone destination media can render. As such, BPC is primarily targeting CMYK.