Hi ,
I am using the html2pdf PHP lib. to create PDF file which contents
text and images.
I want to check DPI of that generated PDF.
is there any tool or way to check that

Thanks
Pravin.

Pravin wrote:

> I am using the html2pdf PHP lib. to create PDF file which contents
> text and images.
> I want to check DPI of that generated PDF.
> is there any tool or way to check that

PDF is in general an vector format and is therefore not affected by the
"resolution-problem". Only embedded images, bitmap fonts and similar things
have their own resolution. But that is individually to each embedded item
and does not apply to the pdf itself.

Robert

Pravin wrote:
> Hi ,
> I am using the html2pdf PHP lib. to create PDF file which contents
> text and images.
> I want to check DPI of that generated PDF.
> is there any tool or way to check that
> 
> Thanks
> Pravin.

You can check the resolution of images with the Preflight Tool of Adobe 
Acrobat.

Robert (and other PDF experts ... ),

I have heard that said before -- PDF is resolution independent -- but
I haven't quite understood that.

Here is what is confusing me.

On my PDF software export, I have 3 options:

Highest quality (for hi-quality printing)
Laser printing quality
Smallest size (for viewing PDF on the web)

Most of my documents in PDF have NO images; so what is the difference
between these three versions of PDF -- if that difference is not
"resolution" ?

This problem has been confusing me for a long time !

Thanks very much,

RW

booklover wrote:
> Robert (and other PDF experts ... ),
> 
> I have heard that said before -- PDF is resolution independent -- but
> I haven't quite understood that.
> 
> Here is what is confusing me.
> 
> On my PDF software export, I have 3 options:
> 
> Highest quality (for hi-quality printing)
> Laser printing quality
> Smallest size (for viewing PDF on the web)

This probably refers to images only.

> Most of my documents in PDF have NO images; so what is the difference
> between these three versions of PDF -- if that difference is not
> "resolution" ?

Probably no difference at all. Have you tried it and made a comparison?

///Peter

On Nov 21, 6:14=A0pm, Peter Flynn <peter.n...@m.silmaril.ie> wrote:
>
> Probably no difference at all. Have you tried it and made a comparison?
>
> ///Peter

Yes, I did -- after I got your message.

For 2 pages of text, with no images:

+ Smallest size (for viewing PDF on the web)  ... around 16 KB
+ Laser printing quality ...
around 47 KB
+ Highest quality (for hi-quality printing) ...          around 145 KB
+ Highest quality + tagged PDF  ...                       around 150
KB

Thanks, Peter

RW

On Nov 21, 6:14=A0pm, Peter Flynn <peter.n...@m.silmaril.ie> wrote:
>
> Probably no difference at all. Have you tried it and made a comparison?
>
> ///Peter

Yes, I did -- after I got your message.

For 2 pages of text, with no images:

+ Smallest size (for viewing PDF on the web)  ... around 16 KB
+ Laser printing quality ...
around 47 KB
+ Highest quality (for hi-quality printing) ...          around 145 KB
+ Highest quality + tagged PDF  ...                       around 150
KB

Thanks, Peter

RW

booklover wrote:
> On Nov 21, 6:14 pm, Peter Flynn <peter.n...@m.silmaril.ie> wrote:
>> Probably no difference at all. Have you tried it and made a comparison?
>>
>> ///Peter
> 
> Yes, I did -- after I got your message.
> 
> For 2 pages of text, with no images:
> 
> + Smallest size (for viewing PDF on the web)  ... around 16 KB
> + Laser printing quality ...
> around 47 KB
> + Highest quality (for hi-quality printing) ...          around 145 KB
> + Highest quality + tagged PDF  ...                       around 150
> KB
> 
> Thanks, Peter
> 
> RW
Can you post links to the samples?

> Can you post links to the samples?

Thank you for asking.

Here is a link to a zipped folder that contains the 4 PDF files that
I've just made:

http://www.box.net/shared/lr5t35e13i

From this page, click the big DOWNLOAD link, unzip and then you will
see the 4 files.

There are 4 PDF files inside only; nothing else.

RW

booklover schrieb:
>> Can you post links to the samples?
> 
> Thank you for asking.
> 
> Here is a link to a zipped folder that contains the 4 PDF files that
> I've just made:
> 
> http://www.box.net/shared/lr5t35e13i
> 
> From this page, click the big DOWNLOAD link, unzip and then you will
> see the 4 files.
> 
> There are 4 PDF files inside only; nothing else.
> 
> RW
> 

I can see following differences:

test-pdf-003-high.pdf    - fonts are full embedded

test-pdf-002-medium.pdf  - fonts embedded with subsets

test-pdf-001-smallest    - fonts not embedded

Thank you, Bernd. I am starting to understand this a little better.

Does anyone know if it is possible to change a PDF (from one of these
three types, to another type) ?

Or must that kind of setting be made, as I did, in the source file
that is not a PDF file ?

Thanks again,

RW

On Nov 22, 4:38=A0pm, Bernd Alheit <be_9...@yahoo.de> wrote:
> booklover schrieb:
> I can see following differences:
>
> test-pdf-003-high.pdf =A0 =A0- fonts are full embedded
>
> test-pdf-002-medium.pdf =A0- fonts embedded with subsets
>
> test-pdf-001-smallest =A0 =A0- fonts not embedded

At Sun, 22 Nov 2009 22:38:23 +0100 Bernd Alheit <be_9002@yahoo.de> wrote:

> 
> booklover schrieb:
> >> Can you post links to the samples?
> > 
> > Thank you for asking.
> > 
> > Here is a link to a zipped folder that contains the 4 PDF files that
> > I've just made:
> > 
> > http://www.box.net/shared/lr5t35e13i
> > 
> > From this page, click the big DOWNLOAD link, unzip and then you will
> > see the 4 files.
> > 
> > There are 4 PDF files inside only; nothing else.
> > 
> > RW
> > 
> 
> I can see following differences:
> 
> test-pdf-003-high.pdf    - fonts are full embedded
> 
> test-pdf-002-medium.pdf  - fonts embedded with subsets
> 
> test-pdf-001-smallest    - fonts not embedded

Right.  None of these affect the *formatting* or the dot resolution of
the text.  The first is more 'portable' and is what publishers want, the
last one is great for on-line access, where minimuzing download time and
disk usage is desirable.  You only *need* fonts to be embedded if you are
NOT using one of the 14 'standard' Adobe fonts.

>                         

-- 
Robert Heller             -- 978-544-6933
Deepwoods Software        -- Download the Model Railroad System
http://www.deepsoft.com/  -- Binaries for Linux and MS-Windows
heller@deepsoft.com       -- http://www.deepsoft.com/ModelRailroadSystem/
                                                                    

Thank you, Bernd and Robert ! ... I am getting the picture about text
in PDF.

About images in PDF:

1. When we talk about the resolution in PDF, we are talking about the
dpi of the included images?  Yes / No

2. When two or more images are included in one PDF file, then the
resolution of these images must be the same dpi: if one image is 300
dpi, then another image cannot be 72 dpi ?  Yes / No

3. When a PDF file has text but not searchable or editable text (let's
say: that a book page is scanned but is not OCR converted: just
scanned to PDF) -- then does this PDF file have a resolution -- just
as if the scan of the book's page had been the scan of a
photograph? ... Yes / No

Thanks again for the help !

RW

booklover wrote:
> Thank you, Bernd and Robert ! ... I am getting the picture about text
> in PDF.
> 
> About images in PDF:
> 
> 1. When we talk about the resolution in PDF, we are talking about the
> dpi of the included images?  Yes / No

Yes

> 2. When two or more images are included in one PDF file, then the
> resolution of these images must be the same dpi: if one image is 300
> dpi, then another image cannot be 72 dpi ?  Yes / No

No, different images can have different resolutions

> 3. When a PDF file has text but not searchable or editable text (let's
> say: that a book page is scanned but is not OCR converted: just
> scanned to PDF) -- then does this PDF file have a resolution -- just
> as if the scan of the book's page had been the scan of a
> photograph? ... Yes / No

When scan a book page you will get one image for this page

> Thanks again for the help !
> 
> RW

At Mon, 23 Nov 2009 10:24:38 +0100 Bernd Alheit <be_9002@yahoo.de> wrote:

> 
> booklover wrote:
> > Thank you, Bernd and Robert ! ... I am getting the picture about text
> > in PDF.
> > 
> > About images in PDF:
> > 
> > 1. When we talk about the resolution in PDF, we are talking about the
> > dpi of the included images?  Yes / No
> 
> Yes
> 
> > 2. When two or more images are included in one PDF file, then the
> > resolution of these images must be the same dpi: if one image is 300
> > dpi, then another image cannot be 72 dpi ?  Yes / No
> 
> No, different images can have different resolutions
> 
> > 3. When a PDF file has text but not searchable or editable text (let's
> > say: that a book page is scanned but is not OCR converted: just
> > scanned to PDF) -- then does this PDF file have a resolution -- just
> > as if the scan of the book's page had been the scan of a
> > photograph? ... Yes / No
> 
> When scan a book page you will get one image for this page

Unless the scanning is followed by OCR (Optical Character Recognition).

> 
> > Thanks again for the help !
> > 
> > RW
>                                                                                  

-- 
Robert Heller             -- 978-544-6933
Deepwoods Software        -- Download the Model Railroad System
http://www.deepsoft.com/  -- Binaries for Linux and MS-Windows
heller@deepsoft.com       -- http://www.deepsoft.com/ModelRailroadSystem/
                                                                            

Thank you very much, again, Bernd and Robert.

And thanks once more, for any help with this last question:

How can I learn more about PDF ?

RW

At Mon, 23 Nov 2009 07:26:41 -0800 (PST) booklover <robinwhitman@gmail.com> wrote:

> 
> Thank you very much, again, Bernd and Robert.
> 
> And thanks once more, for any help with this last question:
> 
> How can I learn more about PDF ?

Adobe has the spec book available for download.  Or you can buy a hard copy
from Amazon.com.

> 
> RW
>                                                                                                           

-- 
Robert Heller             -- 978-544-6933
Deepwoods Software        -- Download the Model Railroad System
http://www.deepsoft.com/  -- Binaries for Linux and MS-Windows
heller@deepsoft.com       -- http://www.deepsoft.com/ModelRailroadSystem/