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Placing greyscale tiff changes the values


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Hello!

I have a barcode in tiff format that needs to be 100% black/white in my document before sending to print.

I have imported the barcode to Affinity Photo, checked with the picker tool that its 100% black/white (100/0 on the greyscale) and saved it as Greyscale TIFF 8-bit.

When placed into Affinity Designer and color picking it, the white appears to be at the correct value (100 grey) but the black reads "3" for some reason and not 0. 

Am I missing something here? Does the color profile in Designer has something to do with it? Im using UNCOATED FOGRA 29 (ISO 12647-2) by request from the printing house. I sense there might be a way doing all this directly into Designer but I haven't figured out how yet.

Thanks in advance, I have been swirling around searching a while in the forum...probably not enough

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Is the barcode tiff CMYK or RGB

iMac 27" 2019 Sequoia 15.0 (24A335), iMac 27" Affinity Designer, Photo & Publisher V1 & V2, Adobe, Inkscape, Vectorstyler, Blender, C4D, Sketchup + more... XP-Pen Artist-22E, - iPad Pro 12.9  
B| (Please refrain from licking the screen while using this forum)

Affinity Help - Affinity Desktop Tutorials - Feedback - FAQ - most asked questions

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The RGB black will not be 100% K (No colour) Black, it will likely be a variation of Rich Black which will use all the colours CMYK not just K. So, RGB 000 will be C:72 M:68 Y:67 K:88 or thereabouts, if you make two squares and set one at RGB 000 and the other at C:0 M:0 Y:0 K:100 you will see the difference in the blacks the CMYK will look more of a dark grey against the RGB black.

You could ask them to send you a CYMK version, I have a barcode app and it can create a CYMK black that will show as 100%K it can export as eps png and tiff

Here is an example in tiff: 1234567890.tiff

iMac 27" 2019 Sequoia 15.0 (24A335), iMac 27" Affinity Designer, Photo & Publisher V1 & V2, Adobe, Inkscape, Vectorstyler, Blender, C4D, Sketchup + more... XP-Pen Artist-22E, - iPad Pro 12.9  
B| (Please refrain from licking the screen while using this forum)

Affinity Help - Affinity Desktop Tutorials - Feedback - FAQ - most asked questions

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