7:37 p.m.
Hi all
Showing my ignorance here, but what is the best way of obtaining a .jpg
file from a .svg file done in Inkcape, while preserving transparencies
and true colours? I am having a bit of a bother doing this - saving as
.svg or .png then opening in Illustrator, Photoshop, Fireworks ...
doesn't preserve the integrity of the original.
I want a .jpg for web use - not everyone can read .svg, can they? And
.png files are rather large? Any comments will be very welcome ...
Regards from Adam in Oz
8 p.m.
Showing my ignorance here, but what is the best way of obtaining a
.jpg
file from a .svg file done in Inkcape, while preserving transparencies
and true colours?
You can't have transparency in JPG. It's not supported by the format.
Use PNG or GIF if you need transparency. In any case, PNG is much
better suited for the type of graphics that Inkscape typically
produces (sharp boundaries, flat color areas). JPG is not efficient
for such graphics and introduces ugly artefacts at boundaries.
8:33 p.m.
Thanks bulia
I should have said "apparent transparencies" - for example, I am doing a
drawing of a young girl seen half through a glass of water. So I can do (in
Inkscape) the "orange" of her shirt by creating her shirt as "orange"
then
superimposing the slightly blue tones of the glass, with appropriate
transparency to give the "perceived" colour. If I do this, what I want to
preserve is the "perceived" orange, affected by the slightly blue glass. I
am not actually worried and don't need or want a transparency, this was my
fault in explaining the question, please accent my apologies. What I want
is to retain the colours achieved by overlaying transparencies in Inkscape,
preferably as a .jpg, or a .gif will do. I find .png files sizes a bit big,
is this not usually so?
So if I want to do this and go to a .gif, do I need to go through Photoshop
(for example)?
Regards, Adam in Oz
-------Original Message-------
From: inkscape-user(a)lists.sourceforge.net
Date: 08/08/04 10:03:15
To: inkscape-user(a)lists.sourceforge.net
Subject: Re: [Inkscape-user] Preserving transparency
Showing my ignorance here, but what is the best way of obtaining a
.jpg
file from a .svg file done in Inkcape, while preserving transparencies
and true colours?
You can't have transparency in JPG. It's not supported by the format.
Use PNG or GIF if you need transparency. In any case, PNG is much
better suited for the type of graphics that Inkscape typically
produces (sharp boundaries, flat color areas). JPG is not efficient
for such graphics and introduces ugly artefacts at boundaries.
1:21 p.m.
On Sat, 2004-08-07 at 20:33, Adam Pearson wrote:
If I do this, what I want to preserve is the "perceived"
orange,
affected by the slightly blue glass. I am not actually worried and
don't need or want a transparency, this was my fault in explaining the
question, please accent my apologies. What I want is to retain the
colours achieved by overlaying transparencies in Inkscape, preferably
as a .jpg, or a .gif will do. I find .png files sizes a bit big, is
this not usually so?
So this is really just question of which formats have good color
preservation/accuracy and decent size?
Of widely web-supported formats, here's the breakdown:
PNG (RGB color) - what Inkscape produces; larger, but best color
accuracy and preserves alpha channel
JPEG (RGB color) - good color accuracy, but can bleach colors from fine
details depending on the subsampling options you
use; you can also have weird artifacts on the sharp
edges that are common with vector-produced graphics
GIF (indexed color) - smaller, but if the image is very colorful GIF
may have problems reproducing the colors using
a palette of only 256
PNG (indeded color) - smaller than GIFs, can preserve alpha (subject
to browser support), but otherwise same
limitations as GIF
As you can see, PNG supports both RGB and indexed color modes.
Note that indexed PNGs will only be smaller if you create them with
decent software (read: not Adobe Photoshop, which has crap PNG support),
or run something like pngcrush on them afterwards.
-mental
3:43 p.m.
On Sun, 8 Aug 2004, Adam Pearson wrote:
Date: Sun, 8 Aug 2004 10:33:28 +1000
From: Adam Pearson <addon@...121...>
Reply-To: inkscape-user(a)lists.sourceforge.net
To: inkscape-user(a)lists.sourceforge.net
Subject: Re: [Inkscape-user] Preserving transparency
Thanks bulia
I should have said "apparent transparencies" - for example, I am doing a
drawing of a young girl seen half through a glass of water. So I can do (in
Inkscape) the "orange" of her shirt by creating her shirt as "orange"
then
superimposing the slightly blue tones of the glass, with appropriate
transparency to give the "perceived" colour. If I do this, what I want to
preserve is the "perceived" orange, affected by the slightly blue glass. I
am not actually worried and don't need or want a transparency, this was my
fault in explaining the question, please accent my apologies. What I want
is to retain the colours achieved by overlaying transparencies in Inkscape,
PNG is lossless so you can always convert the PNG to JPEG or GIF later in
some other application. There is already a feature request for JPEG
export in Inkscape but no one has gotten around to adding it yet (either
that or the Export dialog has no way of using it).
preferably as a .jpg, or a .gif will do. I find .png files sizes a
bit big,
is this not usually so?
Try reducing the PNG from 24-bit colour to 8-bit colour and make sure that
file compression is set to Full. This can make a significant difference,
because PNG is lossless and supports so much more than GIF there is
misunderstanding as to why it produces slightly larger files but with a
little bit of effort you can always produce much smaller files. I have
heard tools like pngcrush recommended and there are plenty of other tools
for getting very small PNG files.
Hope that helps
Sincerely
Alan Horkan
http://openclipart.org
7:39 p.m.
Thanks guys
Thanks to all who responded to my head-scratchings over achieving "good
color preservation/accuracy and decent size" in png files when exported
to other formats - all comments have been very helpful and have
increased my understanding of the topic and my ability to throw files
around in various formats to suit circumstances.
Very much appreciated ... regards,
Adam in Oz
7:04 a.m.
On Sun, 8 Aug 2004, Adam Pearson wrote:
Showing my ignorance here, but what is the best way of obtaining a
.jpg file
from a .svg file done in Inkcape, while preserving transparencies and true
colours? I am having a bit of a bother doing this - saving as .svg or .png
then opening in Illustrator, Photoshop, Fireworks ... doesn't preserve the
integrity of the original.
I want a .jpg for web use - not everyone can read .svg, can they? And .png
files are rather large? Any comments will be very welcome ...
Jpeg is not appropriate for most SVG artwork -- until SVG or maybe
JPEG2000 is better supported by viewers you will want to use PNG for web
viewing. What specifically is lost when you convert to PNG?
The problem with JPEG is that compression is achieved by discarding
high-frequency information. This will create artifacts around "edges",
e.g., any abrupt transition.
--
George White
12:25 a.m.
On Thu, 12 Aug 2004, George N. White III wrote:
On Sun, 8 Aug 2004, Adam Pearson wrote:
> Showing my ignorance here, but what is the best way of obtaining a .jpg file
> from a .svg file done in Inkcape, while preserving transparencies and true
> colours? I am having a bit of a bother doing this - saving as .svg or .png
> then opening in Illustrator, Photoshop, Fireworks ... doesn't preserve the
> integrity of the original.
>
> I want a .jpg for web use - not everyone can read .svg, can they? And .png
> files are rather large? Any comments will be very welcome ...
Jpeg is not appropriate for most SVG artwork -- until SVG or maybe
JPEG2000 is better supported by viewers you will want to use PNG for web
viewing. What specifically is lost when you convert to PNG?
The problem with JPEG is that compression is achieved by discarding
high-frequency information. This will create artifacts around "edges",
e.g., any abrupt transition.
Also, the default output of many png generators is not tweaked to
minimize filesize as much as possible. If your goal with using jpg is
filesize reduction, it can pay off to learn more about the standard png
compression settings. :-)
Bryce
1 a.m.
On Sun, 2004-08-08 at 19:39, Adam Pearson wrote:
Thanks guys
Thanks to all who responded to my head-scratchings over achieving "good
color preservation/accuracy and decent size" in png files when exported
to other formats - all comments have been very helpful and have
increased my understanding of the topic and my ability to throw files
around in various formats to suit circumstances.
Glad to be of assistance. ^_^
-mental
2:06 a.m.
George, Bryce
The original problem was that when I converted a png file to a gif or jpg
(so as to keep the file size small), then areas that were transparent and
showing detail below were going opaque and not showing that underlying
detail. Images were therefore losing their purpose. (This may just have
been a bad day for me at the computer! No, it wasn't - I have just tried
Fireworks and Photoshop and they won't read the Inkscape transparency of a
png file correctly for me.)
As you say, the real solution is to concentrate on compression of the png
files - how is it best to do that? I am on Windows XP Home edition. I have
tried something called Irfanview and it does not read the png file correctly
- loses transparency.
Regards
Adam
2:26 a.m.
Adam Pearson wrote:
George, Bryce
The original problem was that when I converted a png file to a gif or
jpg (so as to keep the file size small), then areas that were
transparent and showing detail below were going opaque and not showing
that underlying detail. Images were therefore losing their purpose.
(This may just have been a bad day for me at the computer! No, it
wasn't - I have just tried Fireworks and Photoshop and they won't read
the Inkscape transparency of a png file correctly for me.)
As you say, the real solution is to concentrate on compression of the
png files - how is it best to do that? I am on Windows XP Home
edition. I have tried something called Irfanview and it does not read
the png file correctly - loses transparency.
use Gimp for bitmap editing, it has a Windows version -
http://gimp.org/windows/
i had no problem with PNG files exported from Inkscape in Gimp.
also, please note that JPEG as a file format does not support transparency
--
nicu
7:03 a.m.
Many thanks, nicu. I have the gimp installed and looks good with that.
Adam in Oz
-------Original Message-------
From: inkscape-user(a)lists.sourceforge.net
Date: 08/13/04 16:24:44
To: inkscape-user(a)lists.sourceforge.net
Subject: Re: [Inkscape-user] Re: Preserving transparency
Adam Pearson wrote:
George, Bryce
The original problem was that when I converted a png file to a gif or
jpg (so as to keep the file size small), then areas that were
transparent and showing detail below were going opaque and not showing
that underlying detail. Images were therefore losing their purpose.
(This may just have been a bad day for me at the computer! No, it
wasn't - I have just tried Fireworks and Photoshop and they won't read
the Inkscape transparency of a png file correctly for me.)
As you say, the real solution is to concentrate on compression of the
png files - how is it best to do that? I am on Windows XP Home
edition. I have tried something called Irfanview and it does not read
the png file correctly - loses transparency.
use Gimp for bitmap editing, it has a Windows version -
http://gimp.org/windows/
i had no problem with PNG files exported from Inkscape in Gimp.
also, please note that JPEG as a file format does not support transparency
--
nicu
6978
days inactive
6986
days old
inkscape-user@lists.inkscape.org
12 comments
7 participants
participants (7)
-
Adam Pearson -
Alan Horkan -
Bryce Harrington -
bulia byak -
George N. White III -
MenTaLguY -
Nicu Buculei