: Does odd or even pixels affect the quality of saved artworks in Illustrator? Suppose I have created a vertical stroke of width 7 px. Now I need it's width a little more than 7 px, to match
Suppose I have created a vertical stroke of width 7 px.
Now I need it's width a little more than 7 px, to match the width of a font's letter's width. (I could do it by changing the offset of font after creating outlines, from it, but I'm not doing it because it somewhat destroys the beauty of font). I made the width from 7 px to 7.1 px and it almost matches with font (I noticed this by zooming in artwork).
Now I expand the stroke. The art board size is 1024x768 px. I saved my design and exported it.
(For privacy, I can't show the image here, but I think description should help you understand my question.)
The image looks great but I have 2 queries about quality of design that might have been affected:
Whould my image be more better and crisp had I used a EVEN stroke width (8 px) and changed it to 8.1 px? Does even and odd make any difference?
Is there any actual meaning of 0.1 px in illustrator? How is this 0.1 px is rendered in final PNG image? Or it is ignored?
PS: I didn't see any noticeable difference when I tried above t
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Yes.
Partial pixels will make a difference when saving/exporting images for the web or digital displays
The web, and all digital displays are built upon a pixel grid of whole pixels. When artwork contains a partial pixel, the rendering engine, whatever that may be, has to determine whether that partial pixel should be rounded up, rounded down, or anti-aliased.
8.1px will most likely be rounded down and displayed as 8px. However, it's not impossible that 8.1px is anti-aliased due to the .1px. Antialiasing would result in a "blend" of sorts between the .1px and the color of pixels neighboring it.
So, imagine you've got an 8.1px black square resting on a white field. That .1px is going to cause the edge of the square to be "blended" between black and white, commonly resulting in 1 pixel of a darker grey at 8px, then 1 pixel of a lighter grey at 9px. So you take an 8.1px square and essentially, un-sharpen the edges and create a 9px image, merely to compensate for that .1px overrun.
This is why Adobe implemented the Align to Pixel Grid feature within Illustrator - to prevent this type of anti-aliasing.
If you want edges to remain crisp and sharp when exporting/saving for web, you need to work in whole pixels always.
Now for print work... pixels mean nothing and it makes little to no difference if something is 8px or 8.1px.
No. Negligible.
The purpose of vector designs is scalability, there should be no reason for 0.1px to be better or worse for the quality of your image in Illustrator.
Yes. Pixels are a unit of measurement and are rasterized according to the dpi settings in illustrator. 300 pixels per inch for example.
A) the 0.1px stroke should translate relatively clean with respect to the output size from illustrator, and B) if someone were to blow up that image and pixelate it, it would distort all of the pixels not just your line. So it isn't ignored per se, but again for relevant purposes, negligible.
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