Image Trace not tracing large files

New Here ,
Jun 25, 2020

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I'm having difficulty with Image Trace. I've used it succesfully for years but for this project it just seems broken. 

 

Macbook Pro, High Sierra, 10.13.6

Illustrator 24.2

 

I've got a file that's a black and white line drawing of rivers in Oregon. If I take a small crop of it I can trace it almost perfectly: 

Screen Shot 2020-06-25 at 12.04.54 PM.jpg

 

But when I trace the full image like so: 

Screen Shot 2020-06-25 at 1.12.35 PM.jpg

 

I get these terribly innaccurate results: 

Screen Shot 2020-06-25 at 1.25.50 PM.jpg   Screen Shot 2020-06-25 at 1.12.15 PM.jpg

 

Any solutions? I can't seem to find any other record of this issue arising.

 

Here's the file if you want to experiment: https://drive.google.com/file/d/1txfHNZ5z36El8RG8iiNxuOc4pie6u8zP/view?usp=sharing

 

Thanks for your time!

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@mj LATEST
Adobe Community Professional ,
Jun 29, 2020

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Hi gabrielamadeus,

It seems you might be hitting a resource ceiling.

You can check this using Activity Monitor on your Mac.

Here are some things I did to reduce the file in Photoshop.

Converted from RGB to Grayscale and cropped away unneeded white space. File size reduction from 162.5Mb > 48.5Mb

Converted from Grayscale to Bitmap and file size dropped to 6.18Mb

Here's a handy resource from fellow ACP Monika Gause on optomizing results.

https://helpx.adobe.com/illustrator/using/image-trace-results-optimization.html#Limitations

I can send you the trace result too if you wish

Good luck

.mj

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