I created an image in Krita that is going to print. wanted to ask if I should take into consideration spacing for bleed-and if its ok if I take extra 1.25-inch white space for bleed-without marking it with lines-just extra white space from the margin-will it is ok in print houses?
and about margin-where in Krita I can set margin?
I save the image as jpg-I need different sizes of the same image-A4...A3...A1-When I scale the same image for different sizes-is the result I see on the screen resembles the print final result? I'm just trying to find a way to check if the images will look well in different sizes after the print-not pixelised and not blurry-Does what I see on the screen in krita is the way its gonna look when printed (without big difference)?

alinsh wrote:it is ok in print houses?

To be sure, contact your printer. They often have PDF or webpage explaining requirement (bleed-margin size, color profile, file format). If not they explain by email.
In Europe, for format under A4 ; I often had 5 millimeters of bleed-margin all around. Sometime just 2 or 3 milimeters for small elements on board games ( tokens, card ). I used to extend the artwork of 5mm all the time when a client asked for something.

alinsh wrote:and about margin-where in Krita I can set margin?

You can use guides, paint them manually on a layer, or use lines on a vector layer. Your choice. In any case, it will be just a feedback for you and only you. You need to hide the guide before exporting it for print. So that's why it's a requirement to know the bleed-margin of your printer ; if this one use 3mm and you planned on a thick 10mm; you'll see part of the trim in the final print. It can be a problem for a book cover and if your bleed-margin extensions are not well painted.

alinsh wrote:I save the image as jpg

Wrong format for printing. It's destructive and support only RGB. It can be used if your printer agree on it and prefer manage the color correction in-house. In this case be sure to use a compression of 100% or up 95% to get not a big loss of details. For sending artwork to your printer, the classic is to use TIFF or PSD. In case of RGB colors, a flat PNG is also OK.

alinsh wrote:I need different sizes of the same image-A4...A3...A1-When I scale the same image for different sizes-is the result I see on the screen resembles the print final result?

No. Unless you use the color profile of the printer, and have a calibrated monitor with a custom color profile done by a calibrator (and the result will be not perfect) you can't get a "What you see is what you get". One of the tip is to ask for a sample to your printer and the source file. So, you can compare both on reality and on your screen and create a dynamic Layer-filter Curve preset to degrade or correct the color to match between source and reality. Then you can reuse the created filter to get an idea what color might look flat or out of printing possibilities.

alinsh wrote:I'm just trying to find a way to check if the images will look well in different sizes after the print-not pixelised and not blurry-Does what I see on the screen in krita is the way its gonna look when printed (without big difference)?

No, screen resolution and printing resolution are both different things. To print a A4 without seeing the pixels , you need 300ppi (pixel per inch) ; it mean your artwork needs to be detailed on a 2480 pixels x 3508 pixels canvas.
My experience is a A3 can be seen from a little distance ; (A4 in a book should be crisp, because in hand of final user) so you can use lower ppi for a A3 poster ( but not in case of a A3 board game cover, for eg. ). Same goes for the A2 and A1 ; you can use less and less pixels per inch. ( If you look closely to the adv printed on bus stops; you'll see a lot of "print dots" ; the resolution target is to have the bus poster visible at 1 or 2 meters. So no need a very thin print resolution.

I hope it will help!

thank you very much -for the detailed explanation