AI Export JPG with wrong size (just little bit)

[Ralph_HK]

Hello.

I am new to use AI CC and today I get a problem.

When I want export a actural size jpg , I find that the jpg is little bit different with the AI artboard size.

I set the artboard size as common A4 size, but the outcome jpg is 210.14 mm x 297.01 mm.

Could anyone help me about that?

Thank you so much!

[Ton Frederiks]

Millimeters are different from pixels. You can have half a mm, but half a pixel does not exist.

Some rounding will occur when converting mm to px and changing the export resolution to something else than 72 ppi (or a multiple of that)

Make sure that the 0/0 ruler point is at the upper left corner and check the size in Illustrator in pixels.

[Ralph_HK]

Thanks for your answering first.

But I think that is not the problem.

I have never like this on before version (I used AI 9 to now, about 10 more years)

This is the first time the output JPG size is not the same as the artboard size....

[Ton Frederiks]

As far as I can tell, it has always been like that, caused by rounding from mm to px.

[Test Screen Name]

It might be that you're using a different tool, or different version of a tool, which shows more decimal places. Compare with an old file to check this out.

[Ralph_HK]

My friend say he face that too.

But I really never happen.... and now I still cannot fix it

Before when I export some jpg to the output vendor, all of the jpg are in actual size.

But now, all of that have 0.xx mm deviation....

[Ton Frederiks]

Do not expect to get perfect mm when saving a file in pixels.

1 mm + 2,835 px and 1 px = 0,353 mm, there will always be rounding errors.

[Test Screen Name]

So did you check a JPEG you made years ago, and what was the result today? Also, how exactly do you read the size? Different apps will give different answers!

[Ralph_HK]

so maybe is the display problem?

Because before I am a PC user and I join a new company in recent day.

This company use Mac. So I don't know is that PC and MAC display would be different.

But I believe that it is not only the display error.

Because when I import the jpg into the AI, I find that the jpg cannot fit size too.
(AI > use A4 artboard to export JPG > import JPG into AI again > draw a 210 x 297mm square to compare with the JPG)

For this step , I am pretty sure before when I use PC, the JPG would be 100% in 210 x 297. (Same size as the square I draw in AI)

I am really no idea whats going on now...

[Ralph_HK]

I just find the work I done before.

The size really different !
So it is the problem of Mac ! ...

Thanks for all of you guys helping here !

[HEBAN]

I have the same problem on PC, windows 10 😞

[HEBAN]

Problem solved! Picture below: