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On the other hand the 'a' and 'b' channels need a little explanation. It has no colour value at all it just contains the contrast between the lightest and darkest points in the image. The 'L' channel, or Lightness, is the easiest to understand as it is a Greyscale.
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But 'Lab' has a mix of one channel with no colour (L), plus two channels with a dual colour combination that have no contrast (a+b). An RGB image is easily understood as there are three logical colours. But when the separate 'Lab' channels are looked at they can seem a little odd at first. Because the 'Lab' contains all possible colours there can be no deterioration in the image quality as all colours translate unaltered. When any image is converted to 'Lab' it will look exactly the same. Normally you would view these as Greyscales when using Photoshop, just as you would when viewing the individual channels in an RGB image.įIGURE 3 The 'A' and 'B' channels are coloured here for illustration purposes This is just for illustration purposes to show which colours the 'a' and 'b' represent. NOTE: The channels have been shown in colour in the figures above and below. You just convert by selecting Image > Mode > Lab Color from the menu bar.įIGURE 2 When the individual channels are viewed the 'Lab' format looks very different There are no settings that the conversion depends on, as with RGB and CMYK, and there are no decisions to be made. No matter what colour space you start with it will always fit within the extreme space of 'Lab'. So every time an image is converted from RGB to CMYK, or back again, it is passed through 'Lab' in the process.įIGURE 1 An RGB image converted to 'Lab' will look exactly the same with no loss of colourĬonverting an image to 'Lab' is the easiest conversion to do. Because of this Photoshop uses it as its native colour space. As such it is an absolute and therefore is not colour managed as there are no degrees of 'Lab' for a colour profile to describe. 'Lab' covers all potential colours, every colour that the human eye is able to see. Look up which profile is best for the print job you have on hand.The 'Lab' colour space is one of the least used image formats as no print production, picture library, or website would ever consider using it. If you’re using CMYK, you likely intend to print whatever it is you’re making. Don’t guess what profile it is you should use. The default color profile may not give you the best results in which case you can change it and select a different one. With CMYK, you have to deal with color profiles. The process is the same except you have to select CMYK Color from the Mode sub-menu. You can likewise convert an image from RGB to CMYK. The action can be undone if you don’t like the results, and you can convert the image from CMYK to RGB again and choose to flatten the image before it’s converted. You can flatten it or attempt to convert it without flattening the image and compare results. You will see an on-screen prompt telling you to flatten the image if you haven’t flattened it already. With the file open, go to Image>Mode and select RGB Color. This is because you might need to flatten the image in order to convert it and once the image has been flattened, you won’t be able to edit it any more. If you have a Photoshop file, it’s a good idea to edit it as much as you need to before you convert it from CMYK to RGB. Open the image or Photoshop file that is in CMYK mode in Photoshop. If you don’t have the source file and are dealing with the final image, there may be some loss in color quality after the conversion. If you have the Photoshop source file for the image that’s in CMYK, you can get excellent results when you convert it to RGB. This works for any image, or for an in-progress file. Photoshop supports both these color modes and it also lets you convert images from CMYK to RGB mode. This has to do with how the colors are rendered and you don’t want to use an image in CMYK for the web as the colors may not look right. Normally, CMYK is used for images that are going to be printed, and RGB is used for images that will be published online. When you use an image editor like Photoshop or Gimp, you have a few color modes that you can choose to create the image.