Re: [Gimp-user] Decompose greyscale to layers (Quin Benson)



Gmic offers the filter
Layers > colours to layers

Which allows tuneable separation of colours

Minimal Area (%) may have to be kept very low (0.01 to 0.02) to receive a
result.

On Fri, 13 Mar 2020, 12:00 , <gimp-user-list-request gnome org> wrote:

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Today's Topics:

   1.  Open PDF at the right width and height (YouNoOat)
   2.  Open PDF at the right width and height (rich404)
   3.  Sizes of an image - display v printing (chuckie)
   4.  Open PDF at the right width and height (YouNoOat)
   5. Re:  Sizes of an image - display v printing (Ofnuts)
   6.  Decompose greyscale to layers (Quin Benson)
   7.  Gimp 2.10 and Streetwear font (glyphs) (vincents)


----------------------------------------------------------------------

Message: 1
Date: Thu, 12 Mar 2020 18:43:51 +0100
From: YouNoOat <forums gimpusers com>
To: gimp-user-list gnome org
Subject: [Gimp-user] Open PDF at the right width and height
Message-ID: <93572 forums gimpusers com>
Content-Type: text/plain; charset=UTF-8

Hello,

I'm trying to convert PDF to image with batch processing.
But I didn't find a way to choose pixel-width and pixel-height during the
opening of the PDF, as in interactive mode (window "import PDF").

Instead of that, Gimp automatically opens the PDF at 100% size AND 100 dpi.

For example :
My PDF is 7,84 x 11,69 inch, not rasterized and fully losless resizable.
As Gimp assumes that the PDF is at 100 dpi, the resulting image (opened
with
"gimp_file_load") is 784 x 1169 pixels.

It's too low, because the PDF contains mainly small texts, not readable at
784 x
1169.

And the idea to use "gimp_image_scale" to increase the image size is not
relevant.
It makes heavier images but not more readable.
Once the image is rasterized, even with a good interpolation, you can't no
more
increase the readability.

The plugin "file-pdf-load" neither have width/height or dpi parameters, so
it
converts the PDF at the same small resolution (768 x 1169).

Could you help me to create large images from PDF by batch processing ?

Thank you - APL

--
YouNoOat (via www.gimpusers.com/forums)


------------------------------

Message: 2
Date: Thu, 12 Mar 2020 19:26:58 +0100
From: rich404 <forums gimpusers com>
To: gimp-user-list gnome org
Subject: [Gimp-user] Open PDF at the right width and height
Message-ID: <93573 forums gimpusers com>
Content-Type: text/plain; charset=UTF-8

Hello,

I'm trying to convert PDF to image with batch processing.
But I didn't find a way to choose pixel-width and pixel-height during
the
opening of the PDF, as in interactive mode (window "import PDF").

Instead of that, Gimp automatically opens the PDF at 100% size AND 100
dpi.

For example :
My PDF is 7,84 x 11,69 inch, not rasterized and fully losless
resizable.
As Gimp assumes that the PDF is at 100 dpi, the resulting image
(opened with
"gimp_file_load") is 784 x 1169 pixels.

It's too low, because the PDF contains mainly small texts, not
readable at 784 x
1169.

And the idea to use "gimp_image_scale" to increase the image size is
not
relevant.
It makes heavier images but not more readable.
Once the image is rasterized, even with a good interpolation, you
can't no more
increase the readability.

The plugin "file-pdf-load" neither have width/height or dpi
parameters, so it
converts the PDF at the same small resolution (768 x 1169).

Could you help me to create large images from PDF by batch processing
?

Thank you - APL

Did you ask this question on one of the Gimp forums recently, seems
familiar.

However.

Do not use Gimp, use ImageMagick.

magick -density 300 infile.pdf -quality 100 outfile.png

and wrap that in a bash or batch file depending on OS.

--
rich404 (via www.gimpusers.com/forums)


------------------------------

Message: 3
Date: Thu, 12 Mar 2020 19:44:33 +0100
From: chuckie <forums gimpusers com>
To: gimp-user-list gnome org
Subject: [Gimp-user] Sizes of an image - display v printing
Message-ID: <93574 forums gimpusers com>
Content-Type: text/plain; charset=UTF-8

I am little confused ...

I have an image that is 828 pixels wide.

If I open it in Paint, and HyperSnap or GIMP and view it at 100% and use a
ruler, the width of the image is about 23cm.

If I drag the image into a Microsoft Outlook email (embed it) or go to the
GIMP
Print Size window, they both report it to be 3.5cm wide!

So, the GIMP editor shows it at a nice size of 23cm visually, but to
print, or
embed it in Microsoft Outlook email it is only 3.5cm width.

Why is it then that the display of it in the editor is 23cm? What changes
need
to be applied so that the image will embed into Microsoft Outlook email at
23cm?
Certainly, I was expectign it to embed at the scale I see it in the GIMP
viewer
and not the anticipate scale for printing.


--
chuckie (via www.gimpusers.com/forums)


------------------------------

Message: 4
Date: Fri, 13 Mar 2020 00:47:39 +0100
From: YouNoOat <forums gimpusers com>
To: gimp-user-list gnome org
Subject: [Gimp-user] Open PDF at the right width and height
Message-ID: <93575 forums gimpusers com>
Content-Type: text/plain; charset=UTF-8

Did you ask this question on one of the Gimp forums recently, seems
familiar.

However.

Do not use Gimp, use ImageMagick.

magick -density 300 infile.pdf -quality 100 outfile.png

and wrap that in a bash or batch file depending on OS.

Thank you Rich404,

This was my first post on this issue. If it seems familiar, perhaps it's
because
it worries many people.
Surprising that on this subject Image Magic is better than Gimp. Lot of
Developpers told me that Gimp have killed Image Magic ...
Anyway Thank you a lot for your acurate answer.

--
YouNoOat (via www.gimpusers.com/forums)


------------------------------

Message: 5
Date: Fri, 13 Mar 2020 10:27:08 +0100
From: Ofnuts <ofnuts gmx com>
To: gimp-user-list gnome org
Subject: Re: [Gimp-user] Sizes of an image - display v printing
Message-ID: <ca83c670-a807-fe97-6197-b12813adec9b gmx com>
Content-Type: text/plain; charset=iso-8859-15; format=flowed

On 12/03/2020 19:44, chuckie wrote:
I am little confused ...

I have an image that is 828 pixels wide.

If I open it in Paint, and HyperSnap or GIMP and view it at 100% and use
a
ruler, the width of the image is about 23cm.

If I drag the image into a Microsoft Outlook email (embed it) or go to
the GIMP
Print Size window, they both report it to be 3.5cm wide!

So, the GIMP editor shows it at a nice size of 23cm visually, but to
print, or
embed it in Microsoft Outlook email it is only 3.5cm width.

Why is it then that the display of it in the editor is 23cm? What
changes need
to be applied so that the image will embed into Microsoft Outlook email
at 23cm?
Certainly, I was expectign it to embed at the scale I see it in the GIMP
viewer
and not the anticipate scale for printing.


When you look at your picture at 100% in Gimp, Paint and other
applications, it is displayed "dot for dot", one pixel of the picture is
one pixel on your screen, and therefore it is displayed using your
screen definition? (so given the size you report we can assume that the
resolution of your display is 828/(23/2.54)=91 pixels/inch).

On the other hand your? picture has an embedded "print definition" which
is used for printing, in your case 828/(3.5/2.54)=600 pixels/inch. This
sets a theoretical size for the picture, size at which the picture is
printed (as long as everything in the print stack abides to it).

Print definition (in Pixels/inch), print size (in inches) and size (in
pixels) are related by the formula:

print size = print definition * pixels

Note that this means that you can only pick two of these values, the
third is determined by the first two.

In Gimp you can un-tick "View>Dot for dot", in which case the picture
will be shown at the print size, if your screen resolution is properly
set? (see Edit>Preferences>Interface>Display).

When you create the image, you should set the size in pixels big enough
so that you can print it at the required size with a print definition of
at least 200 pixels/inch (photo) preferably 300 or more if there is
text/logos or other computer-generated graphics. The advanced options in
"File>New..." let you enter a print size and print definition, and
compute the required size in pixels.



------------------------------

Message: 6
Date: Fri, 13 Mar 2020 09:29:14 +0000
From: Quin Benson <quin benson gmail com>
To: gimp-user-list gnome org
Subject: [Gimp-user] Decompose greyscale to layers
Message-ID:
        <CAJ2cipsUMxbzJe=fp90rBHWDiTwfpsmEmuN8SF-MKvP=
k3c+kw mail gmail com>
Content-Type: text/plain; charset="UTF-8"

Please can anybody suggest a script or plug-in that will decompose a
posterized grayscale image to layers? Or, for that matter, posterize an
image and then decompose the various shades to layers?


------------------------------

Message: 7
Date: Fri, 13 Mar 2020 11:16:54 +0100
From: vincents <forums gimpusers com>
To: gimp-user-list gnome org
Subject: [Gimp-user] Gimp 2.10 and Streetwear font (glyphs)
Message-ID: <93578 forums gimpusers com>
Content-Type: text/plain; charset=UTF-8

Hi All !

Thanks guys for your answers.

I will move to Photoshop/Illustrator for this time :( :( :(

Regards,

Vincent

--
vincents (via www.gimpusers.com/forums)


------------------------------

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