![]() The total number of unique combinations for 8-bits is 256. Remember that each bit is either + or -, represented by either “0” or “1”. 8-bits of data are used to define the tone of each pixel in an image. Let’s take a black and white image first. For photographs we need to remember that images are made up from a collection of pixels. To produce the letter “A”, for example, the computer uses 8-bits of data. Deep inside your computer or camera that bit is really just a positive or negative electrical charge.įor normal data files, 8-bits are used to represent a single letter, number or symbol. And image files are simply data files that contain all the information necessary for your computer to generate an image. Yes, you have optics to focus the images but in it’s core your trusty Digital SLR is a powerful, albeit small, computer system. There are always errors.Your camera is a very powerful computer. If you send a 1200dpi Bitmap picture of lineart to the CTP Machine, it will be imposed as sharp as text or vectors.Īnd you need this format, since vector tracing will never achieve the same detailed result. This causes the sharp look of Text / vectors compared to e.g. Images and rasterized text, Forms etc get 300 dpi. So Vectors and Text (which is a sort of vector) will be imposed at max imagesetter resolution (at least 1200 dpi). The CTP machine will impose with a max resolution of 1200-2400 dpi. If you send a PDF to the imagesetter (by now a CTP-machine for almost 100%), your data will be seperated and rasterized.ĬMYK and Grayscale will be rasterized in around 300 dpi max for each channel. No offense, but maybe not all understand what's the benefit of this file format really is in (offset)printing. Thank you for your effort, but fde101 is right - this will NOT produce a 1 Bit Bitmap. Whereas for 1-bit with alpha, Matte is transparent. Note that for true 1-bit export, Matte must be white. If you need the alpha channel, export the PNG like this: Native true PS bitmap channel has no alpha either. Summed up, the workflow can be literally a pain in the ass, but it is technically possible. Here a quick example (in Publisher v1 on El Capitan, otherwise I couldn't have used Acrobat to preflight), using a placed random Pixabay photo, fully pixel-aligned, "bitmapped" in place, everything colorized with Pantone spot colors set to overprint, exported as PDF/X-3: 1200 ppi though…)ĭouble check in Designer persona with View Mode > Pixels that every pixel object is still 100% pixel alignedĮxport as PDF if you want to send it to print as you see fit, adjust size to its final valueĬonvert the pixel layer to Image Resource do not resize anymore, keep at 100% (it gets more complex if you need e.g. Place a color image, 100% pixel aligned, adjust with Threshold etc. even the bleed must be in integer pixels because that's where the Affinity's "absolute pixel grid" zero point is. Make sure your document is fully in Pixel mode and everything 100% pixel aligned, i.e. ![]() To convert a placed image to 1-bit and K Only in place in a Publisher layout, for export to PDF, for example: ![]() ![]() If you want to convert an image to fake bitmap mode destructively in place in Photo :ĭocument > Convert Format ICC Profile > Gray/8 > Black & White > Absolute Colorimetricīut internally that's not a true bitmap channel. ^ This is a screenshot from v1 export, but the v2 settings are the same. Then you can already export as 1-bit PNG: How can i change a grayscale picture to 1 bit or "k only" in affinity photo?įirst you may want to add a global Threshold adjustment (plus place other adjustments layers below as you see fit) to fine tune the 1-bit conversion non-destrucively. ![]()
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