On samedi 21 janvier 2017 09:11:11 CET jdd wrote:
> > Em 20 de jan de 2017 18:07, "Arran" <
[hidden email]
> >
> > <mailto:
[hidden email]>> escreveu:
> > Hello
> > I am scanning pictures my wife draws analogue with crayons, some
> > coloured
> > and some black/white. They all base on an good and strong A4 paper.
> > I scan
> > them (Epson) with 2400 dpi, and receive usually files of about 4 to
> > 7 MB as
> > *.png files. Saved with TIFF is usually over 30MB, but several tests
> > we
> > produced are not showing any real improvement.
>
> most photocopy machine use as low as 150 dpi, 300 dpi for an A4 is more
> than enough
>
> > printing. However, the original scaned *.pdf
>
> you said you scanned as *png*. png are images, pdf are not. jpg is
> probably enough for your use.
As 'Arran' is scanning drawings, i.e. basically line-art, jpg is not a
recommended format at all due to the "ringing" it always will cause near sharp
edged. That "ringing" is a direct result of the compression method and cannot
be avoided (look up Fourier or Cosine transform).
My choice would also have been png, as it's lossless, supports 16 bit/channel
and alpha. For such single layer images I see no reason to use TIFF (and
several reasons to avoid it: size and number of dialects).
But PDF is indeed an odd choice to store images in. You'll probably need it to
print the image, and might want to keep it as a kind of cache, but it's not
good as a master image (that would be the original .png with the modified
.xcf).
Remco
Locked
Good morning and many thanks for your responses.
First of all, I have to appologise for a grave error I made by mentioning PDF. I have NO such files (yet) used in this project. The mention of PDF should have been PNG.
There was one Question about what I want to do. We live on a touristic Island in Scotland and there is huge demand for original souvenir works of a more artisitc manner. That is where the idea first started. Then we thought out what to do and my wife developed this style (it is probably not unique on the world, but certainly on Arran). After this, we though out what exactly could be offered to the market. Which lead us to a variety of sizes of the pictures. As all of this series are just black ink on white paper, it seems logical to me to convert the original into a vector grafic (here with inkscape) after I have scanned the pictured, cropped the result in Gimp (XCF) free of all surplus white environment, export the result to a PNG, import this into Inkscape and then export it immediately without any other ado as an SVG. This can then be imported back into Gimp in the correct size for further manipulation.
The idea is to produce post cards A6, A4 and 3 prints plus sizes «on demand» I tried it up to a A0 Format to check if the quality of the design is good enough to be blown up and the result is a clear yes. Thanks to the vector technique we would get impeccable results, say for the background in a local Restaurant or so.
Good morning and many thanks for your responses.
First of all, I have to appologise for a grave error I made by mentioning PDF. I have NO such files (yet) used in this project. The mention of PDF should have been PNG.
There was one Question about what I want to do. We live on a touristic Island in Scotland and there is huge demand for original souvenir works of a more artisitc manner. That is where the idea first started. Then we thought out what to do and my wife developed this style (it is probably not unique on the world, but certainly on Arran). After this, we though out what exactly could be offered to the market. Which lead us to a variety of sizes of the pictures. As all of this series are just black ink on white paper, it seems logical to me to convert the original into a vector grafic (here with inkscape) after I have scanned the pictured, cropped the result in Gimp (XCF) free of all surplus white environment, export the result to a PNG, import this into Inkscape and then export it immediately without any other ado as an SVG. This can then be imported back into Gimp in the correct size for further manipulation.
The idea is to produce post cards A6, A4 and 3 prints plus sizes «on demand» I tried it up to a A0 Format to check if the quality of the design is good enough to be blown up and the result is a clear yes. Thanks to the vector technique we would get impeccable results, say for the background in a local Restaurant or so.