Re: Graphics DPI, FrameMaker, & Acrobat troubles

["Dov Isaacs" <isaacs@xxxxxxxxx>]

Thomas,

Your step (5) is useful only for the purpose of fooling FrameMaker
into choosing an initial size for the EPS file's frame. You should
make sure of course that in fact no resampling or interpolation is
done at that point. You can also uniformly scale the EPS file's frame
once imported into FrameMaker. The choice is obviously up to the user.
The use of a program such as SnagIt is necessary only if it provides
some added value beyond the built-in capabilities of Windows. If
all you want or need is to grab a Window or the entire screen as is,
it buys nothing. Make sure though that SnagIt (or any of its compatriots)
do not do any modification to the "bits" in terms of resampling).

        - Dov


At 5/22/2001 10:44 AM, Thomas Neuburger wrote:
>Hi Dov,
>
>The only difference in your procedure and mine (which was derived from yours) is in step 5 below (bolded). 
>
>I don't think I've lost anything in image quality by doing this, and I knew going in that 150 dpi was what I needed in Frame. But just checking...
>
>Thanks,
>
>Tom

*

>I wrote in a previous post:
>
>>The procedure:
>>
>>1. Capture screen in SnagIt @ 72dpi (native for my monitor).
>>
>>2. Save image as 8-bit tiff.
>>
>>3. Open the tiff in PhotoShop, discarding color information when prompted.
>>
>>4. Change to grayscale (select Image / Mode / Grayscale).
>>
>>5. Change resolution to 150dpi with interpolation turned off (select Image / Image Size). With interpolation off here, the images size automatically changes to about half as large.
>>
>>6. Save as PhotoShop EPS with:
>>     binary encoding
>>     interpolation on
>>     8-bit tiff preview
>>
>>    Here's where interpolation matters, as Dov Isaacs has pointed out many times.
>>
>>7. Import EPS as is into FrameMaker (no resizing).
>>
>>This process produced a slightly better (or an imagined slightly better) image when PDF'ed and test-printed to Docutech than resizing in step 5 to 300 dpi with bicubic interpolation on, then resizing to 50% in FrameMaker. In either case, the test output was very good, but we thought we saw a difference.

*

>You wrote:
>  
>>...
>>
>>(4) Do not resize or change resolution of the image!!!!!!
>>(Why? Because you generally don't know at this time exactly what the
>>magnifications and resolutions are that you will be viewing and printing
>>with! In fact, zooming in and out with Acrobat or Acrobat Reader changes
>>those requirements on the fly. Better to simply just have the captured
>>data. Upsampling or downsampling at time of need to exact specifications
>>yields much better results than multiple such transformations!)


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