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<p>Sorry to come back to this: every document has a property called
"Image Preferred DPI" that can be used to represent the printing
intentions of that document.</p>
<p> Apparent dimensions are a result of deviding the available
pixels in the Image by the print intentions .<br>
if the user like to send the document to a professional printing
house then all images need to have a DPI of minimal 254, laser
printers need 150 DPI and on screen presentations 96 DPI<br>
</p>
<p>Tomaz has this implemented a feature called "Image Preferred DPI"
so the dimensions of an image in the document can been
checked/controled by the number of pixels in the image and the
print intentions off a document.</p>
With a Preferred DPI of 254 and 2450 pixels in the image, the image
can be displayed at a maximum size of 10 inches. If the image is
smaller, then fewer than 2450 pixels are needed.<br>
So the "Image Preferred DPI" can be used to determine the "Print
Intentions" for a Document, and it can easily calculate how many DPI
or pixels an image needs.
<div class="moz-cite-prefix">grtz</div>
<div class="moz-cite-prefix">Fernand</div>
<div class="moz-cite-prefix"><br>
</div>
<div class="moz-cite-prefix">On 31/08/2023 5:05, Lodev wrote:<br>
</div>
<blockquote type="cite" cite="mid:570c44b8-3d15-40dc-9337-6d0142242a58@ossii.com.tw">
<p>Hi,<br>
</p>
<div class="moz-cite-prefix">Tomaž Vajngerl 於 2023/8/31 03:13 寫道:<br>
</div>
<blockquote type="cite" cite="mid:CA+Ev6_ZSxhkpUyHqhOWc3qVGKd=mvGuaLhPv2JqfL1dr2MAKbA@mail.gmail.com">
<pre class="moz-quote-pre" wrap="">Hi,
On Tue, Aug 29, 2023 at 9:09 AM Lodev <a class="moz-txt-link-rfc2396E" href="mailto:lodev@ossii.com.tw" moz-do-not-send="true"><lodev@ossii.com.tw></a> wrote:
</pre>
<blockquote type="cite">
<pre class="moz-quote-pre" wrap="">Sorry if I'm asking a stupid question here. First, I've never seen or
used a document with "multiple instances that all point to the same
image in the document".
</pre>
</blockquote>
<pre class="moz-quote-pre" wrap="">That's easy - drag the image while holding ctrl and drop. It will make
a copy of the Graphic, but it still references the same instance and
you can resize each one independently. If you save the document there
will be only one image saved.</pre>
</blockquote>
<p>Thanks.</p>
<blockquote type="cite" cite="mid:CA+Ev6_ZSxhkpUyHqhOWc3qVGKd=mvGuaLhPv2JqfL1dr2MAKbA@mail.gmail.com"><span style="white-space: pre-wrap">And I take "the image in the document" or "The</span>
<blockquote type="cite">
<pre class="moz-quote-pre" wrap="">size the image takes up in the document" seems to be the "Apparent
dimensions", 4.24" in this case. Is it?
</pre>
</blockquote>
<pre class="moz-quote-pre" wrap="">Yes - the document has a size and combined with the size of the image
(in the document, not what it is set in SVG) you can calculate the
actual needed DPI relative to the document.
</pre>
<blockquote type="cite">
<pre class="moz-quote-pre" wrap="">That is, even if there are
multiple images in this document which the source is the same one (I
still don't know how to do that), shouldn't it be calculated regarding
to the "Apparent dimensions" here? I mean, after all, that is what user
set in the document.
</pre>
</blockquote>
<pre class="moz-quote-pre" wrap="">That's the point - what is important is the size of the image in the
document, not what the size is the SVG image.
</pre>
<blockquote type="cite">
<pre class="moz-quote-pre" wrap=""> Since the image shown in the document is actually
4.24"x4.24", while the original svg file is 0.21"x0.21, shouldn't it be
20 times (4.24/0.21 ~= 20) DPI, that is, 96*20 = 1920 sent to xBitmap()?
</pre>
</blockquote>
<pre class="moz-quote-pre" wrap="">Yes, that seems correct. But this is only for this case - another case
would need another factor. For example if you resize the image in the
document to 0.42 x 0.42, you would use the factor 2.
</pre>
<blockquote type="cite">
<pre class="moz-quote-pre" wrap="">We tried to set Size(20,20) to get aDPI, or directly set aDPI to
(1920,1920), they both ended up 4.24"x4.24" with 99DPI, which is good
enough. Do you think it a reasonable thought?
</pre>
</blockquote>
<pre class="moz-quote-pre" wrap="">That's only for this image where 20 is correct - you would need
another number calculated per image. Also use a constant DPI factor as
I already said at the beginning, not the size of the output device.
</pre>
</blockquote>
<blockquote type="cite" cite="mid:CA+Ev6_ZSxhkpUyHqhOWc3qVGKd=mvGuaLhPv2JqfL1dr2MAKbA@mail.gmail.com">
<blockquote type="cite">
<blockquote type="cite">
<pre class="moz-quote-pre" wrap="">So you will need to first find the place where conversion for the
embedded PNG and properly calculate the size at that place - not
inside this method.
</pre>
</blockquote>
<pre class="moz-quote-pre" wrap="">The size should be the Apparent dimensions, since in the document it was
set to that size. That's what we thought.
</pre>
</blockquote>
<pre class="moz-quote-pre" wrap="">Yes - it needs to be the size in the document, not the size of SVG.
</pre>
<blockquote type="cite">
<pre class="moz-quote-pre" wrap="">BTW, if so, how can we get the Apparent dimensions in this method?
</pre>
</blockquote>
<pre class="moz-quote-pre" wrap="">You will have to set it from the outside as a parameter - as it
depends on the image and here you don't have the information.</pre>
</blockquote>
<p>So, that's what we thought - to calculate the necessary DPI by
Apparent dimensions every time we export to docx. </p>
<p>Could you please give us some hint about where to get the
Apparent dimensions? It's not very trivial to us. We'd like to
give it a try to provide a patch for this issue.<br>
</p>
<p><br>
</p>
<p>Thanks for your help,</p>
<p>Dev<br>
</p>
</blockquote>
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