![]() Photoshop uses the color settings preferences to convert neutral grays into colors. However, many people seem to think that this simply adds three new channels (cyan, magenta, and yellow), and leaves all the grayscale information in the black channel. You can simply switch your image from grayscale to CMYK using the Mode menu. You can use two methods- simple conversion or copying into a new file. In this article we’re discussing using CMYK to create duotones, so you’ll want to switch your image from Grayscale mode to CMYK mode. ![]() Converting Grayscale Images to Colorīecause a multitone image typically represents a grayscale image using color, you generally begin with a grayscale image. However, if you’re creating spot-color multitones rather than process-color multitones in CMYK mode, you may have to ignore the colors you see on the screen (which are RGB representations of CMYK colors). Photoshop knows how to represent most spot colors reasonably well on screen when you’re in Duotone mode. This can be very helpful, especially when making small tweaks to the curves (see Figure 1).įigure 1: Grayscale reproduction with the four process inks And you can use features like the white-and-black-point clipping display in Levels to make decisions about your curves. Working in CMYK mode, however, gives you the chance to actually see (interactively) how your curves are affecting the image data. On the other hand, if you’re creating multitones in CMYK mode, you may be changing the image data in each channel, so you want to minimize the number of adjustments you make to avoid image degradation (or use adjustment layers). Or, if your art director decides to print with green instead of yellow ink, you can quickly change the tonal curve to adjust for the difference in ink density. That means you can quickly repurpose the image to a number of different output devices. In Duotone mode, you can always change the duotone curves without affecting the underlying grayscale image data. (We recommend PSD or PDF.)Īdjusting tone. You can save a duotone image in PSD, PDF, or EPS format. For instance, you cannot import a multichannel PSD file into InDesign - it just doesn’t know what to do with it. When you output a multitone image, the mode it’s in may have an impact on your output process. There’s also no way to create a gradient blend between two spot colors while in Duotone mode. However, this is easy to do in any other mode.īlends. For example, it’s a pain to make a 20 percent blue square in the middle of an image, without black also printing in it. In Duotone mode, there’s almost no way to create a single area in which only one color is present. Similarly, a two-channel multichannel file is twice as large as a duotone. CMYK images, then, are four times the size, because each pixel is described with 32 bits of information, even if you’re using only two channels. ![]() An image in Duotone mode, whatever the number of inks, is saved as an 8-bit grayscale image along with curves. Applying the ZIP compression option to the TIFF format can help keep the RGB file size closer to grayscale, if no color has been added yet.File size. RGB TIFF files are typically larger than grayscale TIFF files because they have three channels instead of one. If you do this in Photoshop, you are changing the color mode of each file and then you must save that change, altering the originals.ĭon’t be surprised if the file sizes gets bigger.If you do this in Lightroom Classic, you are exporting copies as RGB TIFF files, leaving the originals unchanged.Note that either way, modified files will be provided to Silver Efex: In other words some people have this problem in reverse: They want a grayscale mode file out of Lightroom Classic and it can’t provide it, it has to be done in Photoshop. The only color spaces supported for export are RGB spaces and printer profiles. If the problem is that SilverEfex won’t recognize grayscale and requires RGB, Lightroom Classic export should help because Lightroom Classic is actually incapable of keeping them in grayscale mode on export. But you can change them in Lightroom Classic too, by exporting new copies of them.
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