Since you're talking pixels, I assume it's a raster (bitmap) image. So select it and click "Edit Bitmap" which will import it into PhotoPaint. Now create a mask by hitting Ctrl-M (or you can use the magic wand mask...) Now go to Mask, Mask outline, Reduce, and enter 1 for the pixel value. Then go to Object, Clip Mask, Create from Mask. Now you should have your choke. Click X to exit PP and "yes" to save the new image in your Draw document.

(If this is a vector graphic, don't worry about pixels. Give it a white outline and assign a point value to it...)

 

It is a vector graphic.... I am using X6 ..... How do I assign an outline and make it smaller to make a choke.

Sorry.... I am a super newb at this

 

You can choke a vector object by adding a white outline to it. Select the object and then right click on the white square on your pallet. Open the outline menu and specify the thickness of the outline. Do not select "Behind Fill." For a spot color underbase, I use a 1.2 point outline which will give you a .6 point choke. That's fairly tight and you can make it a little larger if you want for easier registration. Just remember, the tighter of a choke you're able to work with, the better the print will look.

You can also spread the overprint color rather than choke the base. Often when using an underbase this is a better option.

 

Black shirt!!

Booyah!!

 

Black shirt!! Booyah!!

I just got it today!

 

Please <spread> a little knowledge my way on choking/trapping... Using Corel X6 and selecting a vector image, then inside contour (whatever dimension) creates a choked (inside) image. Just right-click to separate and you have it... Correct? Very thin lines disappear on underbase, but lines that small are not that noticeable in final print anyway. If the small lines are needed, I suppose one could use an outside contour... It all depends on artwork and what kind of detail you are looking for.

Someone with clear understanding of this please respond before I do too much damage. Thanks.

 

If thin lines are disappearing you might want to spread the overprint rather than choke the underbase. It depends on the graphic whether you apply a spread or choke. You can use contour but for some shapes it can result in some funky looking corners. Outline gives you a little more control over the appearance.

 

Thanks Ripcord... In Corel, is there a way to Choke (create a negative outline)?

 

Unless you select "behind fill" in the outline properties, the outline will fall half inside and half outside the shape. So for artwork you can often just apply a white outline to a shape to choke it. Depending on the artwork, sometimes this isn't sufficient and you need to get a little creative but for a basic choke this will work. If you like you can convert the outline to a curve and use it to trim the original.