IrfanView DPI setting?

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Can any IrfanView users around explain why in its Print Preview window
DPI is always shown as 360 DPI? That box is not editable, so is that
just a fixed default?

--
Terry, West Sussex, UK
 
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Terry Pinnell wrote:

> Can any IrfanView users around explain why in its Print Preview window
> DPI is always shown as 360 DPI? That box is not editable, so is that
> just a fixed default?

The value describes the printing resolution, which can be set in the
printer driver.

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Ola
 
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"Ola Forsström" <olaforsstrom@hotmail.com.invalid> wrote:

>Terry Pinnell wrote:
>
>> Can any IrfanView users around explain why in its Print Preview window
>> DPI is always shown as 360 DPI? That box is not editable, so is that
>> just a fixed default?
>
>The value describes the printing resolution, which can be set in the
>printer driver.

Thanks, Ola, I hadn't realised that. But I'm darned if I can find any
way to set it for my printer driver here. I have an Epson Stylus C82.
Neither in Properties or Printer Preferences can I find a DPI setting.

--
Terry, West Sussex, UK
 
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Terry Pinnell wrote:


> Thanks, Ola, I hadn't realised that. But I'm darned if I can find any
> way to set it for my printer driver here. I have an Epson Stylus C82.
> Neither in Properties or Printer Preferences can I find a DPI setting.

Printers don't have an infinitely variable DPI settings.

They may not show an actual DPI setting.. Sometimes all you get to
choose is draft, fine, superfine or other similarly named settings.
This is all you really need.

This is all you really need to know. If you choose the best quality,
you get the maximum DPI your printer is capable of. The lower qualities
provide a lower DPI.
 
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Jim Townsend <not@real.address> wrote:

>Terry Pinnell wrote:
>
>
>> Thanks, Ola, I hadn't realised that. But I'm darned if I can find any
>> way to set it for my printer driver here. I have an Epson Stylus C82.
>> Neither in Properties or Printer Preferences can I find a DPI setting.
>
>Printers don't have an infinitely variable DPI settings.
>
>They may not show an actual DPI setting.. Sometimes all you get to
>choose is draft, fine, superfine or other similarly named settings.
>This is all you really need.
>
>This is all you really need to know. If you choose the best quality,
>you get the maximum DPI your printer is capable of. The lower qualities
>provide a lower DPI.
>

OK, thanks. It's a black art to me - but as you say, if I don't need
to know, so be it!

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Terry, West Sussex, UK
 
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Terry Pinnell wrote:
> Can any IrfanView users around explain why in its Print Preview window
> DPI is always shown as 360 DPI? That box is not editable, so is that
> just a fixed default?
>
Never noticed that before, on my system it says 0DPI. I guess it has
something to do with the printer driver....


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Ron Hunter rphunter@charter.net
 
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Terry Pinnell wrote:
> Can any IrfanView users around explain why in its Print Preview window
> DPI is always shown as 360 DPI? That box is not editable, so is that
> just a fixed default?
>
It's a bit of a mystery to me too but take peace in the knowledge that
your printer driver doesn't care much what you feed it, it will mess
with the file size until the printer is happy. Fact is your 360 dpi
output is interpolated up to 720 dpi on some printers and down to 300
dpi on others.

Douglas
 
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Ryadia <just@the.group> wrote:

>Terry Pinnell wrote:
>> Can any IrfanView users around explain why in its Print Preview window
>> DPI is always shown as 360 DPI? That box is not editable, so is that
>> just a fixed default?
>>
>It's a bit of a mystery to me too but take peace in the knowledge that
>your printer driver doesn't care much what you feed it, it will mess
>with the file size until the printer is happy. Fact is your 360 dpi
>output is interpolated up to 720 dpi on some printers and down to 300
>dpi on others.
>
>Douglas

Thanks, Douglas. As you probably saw from my reply to Ola, it seems I
can't alter it anyway. But doesn't that mean I can't control the size
of the print out? If the image is 412 x 324 pixels in size and the DPI
is fixed at 360 DPI, then the print would be about 1.1" wide, yes? Yet
the IrfanView Print Preview shows it as about ten times that.

Here's the actual file
http://www.terrypin.dial.pipex.com/Images/72DPI-Myth-7.jpg
and here's a screenshot of the Print Preview
http://www.terrypin.dial.pipex.com/Images/IrfanViewPrint1.jpg

BTW, I'm also puzzled why the preview is distorted, when the option
for 'Original' is set?

All highly confusing - but no doubt will become obvious once the penny
drops <g>

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Terry, West Sussex, UK
 
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Terry Pinnell wrote:

> Thanks, Douglas. As you probably saw from my reply to Ola, it seems I
> can't alter it anyway. But doesn't that mean I can't control the size
> of the print out? If the image is 412 x 324 pixels in size and the DPI
> is fixed at 360 DPI, then the print would be about 1.1" wide, yes? Yet
> the IrfanView Print Preview shows it as about ten times that.

The *image resolution* (PPI) is set in Image>Resize/Resample Image
(or Image>Information =>Set).

--
Ola
 
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Ron Hunter <rphunter@charter.net> wrote:
>Terry Pinnell wrote:
>> Can any IrfanView users around explain why in its Print Preview window
>> DPI is always shown as 360 DPI? That box is not editable, so is that
>> just a fixed default?
>>
>Never noticed that before, on my system it says 0DPI. I guess it has
>something to do with the printer driver....

Hmm. 0dpi means that you can keep using the same paper
over and over again... ;-)

---- Paul J. Gans
 
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Paul J Gans wrote:
> Ron Hunter <rphunter@charter.net> wrote:
>
>>Terry Pinnell wrote:
>>
>>>Can any IrfanView users around explain why in its Print Preview window
>>>DPI is always shown as 360 DPI? That box is not editable, so is that
>>>just a fixed default?
>>>
>>
>>Never noticed that before, on my system it says 0DPI. I guess it has
>>something to do with the printer driver....
>
>
> Hmm. 0dpi means that you can keep using the same paper
> over and over again... ;-)
>
> ---- Paul J. Gans

Hmmm. No more one hour Kodak kiosk prints, though.

Gonna take a looooong time to upsample to 300 :)

Ken
 
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Paul J Gans wrote:
> Ron Hunter <rphunter@charter.net> wrote:
>
>>Terry Pinnell wrote:
>>
>>>Can any IrfanView users around explain why in its Print Preview window
>>>DPI is always shown as 360 DPI? That box is not editable, so is that
>>>just a fixed default?
>>>
>>
>>Never noticed that before, on my system it says 0DPI. I guess it has
>>something to do with the printer driver....
>
>
> Hmm. 0dpi means that you can keep using the same paper
> over and over again... ;-)
>
> ---- Paul J. Gans

That would be nice, but it doesn't seem to affect the actual print. Grin.


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Ron Hunter rphunter@charter.net
 
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Terry,

Realize that scaling and resampling are very different operations.

Also realize that image resolution in dpi, and printer quality settings in
dpi, are also very different things. Even if both are specified in dpi -
they are very different concepts.

You resample your image at the Image - Resize/Resample menu. In Irfanview,
this ALWAYS resamples, that is, it always changes your image to be
different dimensions in pixels (modify the dickens out of the pixels).
Those different pixels will then print a different size of course, but the
main idea is that you changed the pixel dimensions.

Or Irfanview menu Information - Resolution (Set) will scale the image to
print a different size on paper without affecting the pixel dimensions at
all. This is likely what you want to do to set a print size.

In many other programs, this choice of resample or scale is accomplished
in the same one resize dialog box, by checking or unchecking a Resample
box there.

The Irfanview Print menu also allows scaling too, to print some size in
inches, but which then does not show the new printing resolution dpi value
there. It changes dpi to scale the image, it just doesnt show the dpi
result. But you can know what it is by (pixel dimension) / (printed size
in inches) = printing resolution dpi.

On the Print menu, the dpi value at the left (next to Printer Setup) is
NOT about image pixels, not about the image at all, but instead is about
the printers print quality setting, and is about ink drops per inch
instead of image pixels per inch. It is a quality setting, comparing to
draft mode, normal mode, fine mode, etc. You can change it in the
Printer Setup button, and then Properties to enter the driver properties.

--
Wayne
http://www.scantips.com "A few scanning tips"
 
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Wayne wrote:

> You resample your image at the Image - Resize/Resample menu. In
> Irfanview, this ALWAYS resamples, that is, it always changes your
> image to be different dimensions in pixels (modify the dickens out of
> the pixels). Those different pixels will then print a different size
> of course, but the main idea is that you changed the pixel dimensions.

[Image - Resize/Resample menu]
If you check "Units: pixels" (and don't alter the pixel values)
and then enter a new DPI value (actually PPI), IrfanView WON'T
resample new pixels.

--
Ola
 
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In article <35nze.2834$n04.1960@reader1.news.jippii.net>,
olaforsstrom@hotmail.com.invalid says...

>[Image - Resize/Resample menu]
>If you check "Units: pixels" (and don't alter the pixel values)
>and then enter a new DPI value (actually PPI), IrfanView WON'T
>resample new pixels.

You're right. Pity that doesnt show the new printed size in inches as a
guide (because inches is normally what scaling is trying to set). The
File-Print menu scaling is the opposite, shows the new printed size in
inches, but doesnt show the resulting dpi. The Information menu shows
both, however we must enter dpi twice for both width and height.

But Irfanview is a great screen viewer program.

--
Wayne
http://www.scantips.com "A few scanning tips"
 
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Ron Hunter <rphunter@charter.net> wrote:

>Terry Pinnell wrote:
>> Can any IrfanView users around explain why in its Print Preview window
>> DPI is always shown as 360 DPI? That box is not editable, so is that
>> just a fixed default?
>>
>Never noticed that before, on my system it says 0DPI. I guess it has
>something to do with the printer driver....

It's a black art to me!

FWIW, here's Irfan's reply to the very similar email I sent him at
same time of my OP. Here, I cannot change the printer driver DPI, even
if I was brave enough to want to try it <g>.

====================
No, the print dialog will show the image either in original DPIs, or,
if the image size is larger than paper size, it shows it using maximal
paper size.

In my print dialog I see for 7 DPIs, A4 paper, original size:
resulting image size: 21x29,7 cm. If you in image->info, change the
DPI, you will get another size.

360 DPI: you mean probably the printer DPI? This is a value from your
printer, use the Printer settings button, to change, if your driver
allows that.

=> nothing is wrong.

Irfan
====================

--
Terry, West Sussex, UK
 
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