John, this is tremendously helpful. Thankyou.
Incidentally, I solved the mystery of the bloating file and it's as simple as
this:
Without thinking, I opened the file attached to my editor's email in Preview
and saved it from there. Seems I made a silly mistake, though I suppose it
stems with unfamiliarity.
I want to thank all of you who took the time to help. All your advice and
insights have notched me along the learning curve.
many thanks
Michael
John McGhie wrote:
Hi Michael:
When you make a PNG image, one of the settings you specify is the
"resolution". This is not a "fault" with the PNG image format, it's a
setting you need to make. If you set the quality to "low", that's what you
will indeed get
Many programs such as Microsoft Office will set the quality very low if you
say you want to "email" the result. Often they will cut it to 96 dpi.
For laser printing, you need to override the automatics and set 300 dpi.
For offset printing, you need to set at least 1200 dpi (preferably 9600).
And, of course, the higher the quality, the bigger the file
An 8-1/2 x 11 page at 96 dpi is 215,424 bytes. At 300 dpi it's 673,200, at
1,200 dpi it is 2,692,800 and at 9,600 dpi it is 21,542,400.
The real benefit of PNG is that it compresses the file by 20 to 1, so the
actual sizes on disk are 1/20th of the above.
But if you get poor quality from a PNG, it's because you set the quality too
low for your purpose when you made it.
I don't remember if anyone discussed the "Dual Format Images" problem in
this thread, but that may also have a bearing on the result.
If you create a document full of images, Word stores the images in the
document, in the native format for that platform. If you manipulate the
images in ANY way (say, by stretching or reducing them slightly) after you
have inserted them into the document, Word stores another copy of the image,
with your changes applied. So unless you manipulate the images outside Word
first, and insert only the finished, sized, adjusted image into the
document, Word will always store two copies of every image: the unchanged
original, and the changed version.
If you then send that document to a cross-platform version of Word, the
receiving copy of Word will convert those images into the native formats for
the platform it is running on. It does NOT remove the original, or the
changed version of each image. So for each image you now have four copies
in the document, an original and a converted version in PNG, and an original
and a changed version in PICT.
You may notice the file puts on a little weight if you allow this to happen
The key is: "Use graphics software to finalise images, and don't insert
until it's exactly the way you want to print it. Then use
Insert>Picture>From File... To insert only a single version of the image, at
exactly the size and resolution you intend to print.
If you choose PNG as your image format, Word will leave it alone, on either
platform. As it will with EPS, but the "preview" in the document will look
very low quality.
Hope this helps
On 13/10/09 7:06 PM, in article 9d85643842e3e@uwe, "MichaelC via MacKB.com"
Hi John,
[quoted text clipped - 66 lines]
Finally, in any case, Acrobat's "reduce file size" command work well.
This email is my business email -- Please do not email me about forum
matters unless you intend to pay!
--
John McGhie, Microsoft MVP (Word, Mac Word), Consultant Technical Writer,
McGhie Information Engineering Pty Ltd
Sydney, Australia. | Ph: +61 (0)4 1209 1410
+61 4 1209 1410, mailto:
[email protected]