Convert Colors spoil image quality! Why?

Hello!
In previous post i mentioned loss of image's quality. Now i tested it again and made example. Don't see any option for avoiding it. Maybe (and probably that's so) i just can't find some important preference. I change in preferences in Categories Convert form/to PDF jpg and tiff option to maximum but it didn't do any good.
Before and after (zoom 200%):
Any ideas?
P.S. Acrobat Pro X.
Thanks.

Okay do you have an original of the design.
try saving in 300 or 600 DPI create the pdf.
the try adding the Graphic
Click on Tools menu Content editing
next click on add image
locate the image.
Now place the image approximately where it should be.
then choose the image and place in desired area.
Save
see if image looks better.

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Okay do you have an original of the design.
try saving in 300 or 600 DPI create the pdf.
the try adding the Graphic
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Thomas Crowley wrote:
I've opened the .jpg image in Illustrator. It is a line drawing.
Those two statements constitute a logical fallacy. A JPEG image is a bitmap, and not, in any way or fashion, a "line drawing". Therefore,
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is because the "individual parts" of the image are single color pixels. To "edit" these, you need a bitmap editor.
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Per Berntsen wrote:
My view on this is somewhat different ...
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Photoshop
Description
Lightroom
0
Low
0-7%
1
Low
8-15%
2
Low
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3
Low
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4
Low
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5
Med
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6
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7
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8
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9
High
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10
Max
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11
Max
85-92%
12
Max
93-100%
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Message was edited by: Jimbo2001

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(contributions requested) that shows much higher quality slide shows than either iPhoto or Aperture 3.
You click on a folder of jpegs and it almost immediately generates thumbnails and within a few seconds
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Message was edited by: Jimbo2001

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Convert Colors spoil image quality! Why?

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