Hi sanal,
Actually, its not the pixels that count, but the dpi - dots per inch.
For example for a 100x100 image, with a dpi of 200 dpi would measure
0.5x0.5 inches. If you print the same image at 400 dpi, then you get a
0.25x0.25 inch image. That is, at 400 dpi, you would need a 400x400
image to print 1 inch square.
Strictly speaking, the DPI is not an image attribute, but an attribute
of the display device. You specify the dpi you want when you print. So
its the dpi that you should be playing with.
The 51x37 pixel image would give you stamp size on a display device with
80 dpi -- typically many computer screens. However I think 51x37 is too
small to be clear. Most printers use 200 dpi. In fact some image
printing programs would let you specify the physical size directly and
calculate the dpi itself.
Don't reduce the pixel count, change the dpi when printing or use a
printing software that let us say the physical size directly.
Regards
Manoj
On 18/03/2010 9:42 PM, sanalkumar mr wrote:
Does anybody think that the pixel values for a stamp size image given
here enough to get the quality image.? Can pixel values be replaced
with 1.8cm x1.3 cm ie stamp size? In other words 51x37 with 1.8cm x
1.3 cm ? Any idea? Thanks in advance....sanal
- Show quoted text -
On Thu, Mar 18, 2010 at 9:25 PM, sanalkumar mr
<[email protected] <mailto:[email protected]>> wrote:
But still the quality comparatively very less.....What may be the
reason? Any idea?..sanal
On Thu, Mar 18, 2010 at 9:19 PM, sanalkumar mr
<[email protected] <mailto:[email protected]>> wrote:
Dear Jos Collin...Thanks a lot for your timely support..sanal
(I'll try it)
On Thu, Mar 18, 2010 at 8:11 PM, Jos Collin
<[email protected] <mailto:[email protected]>> wrote:
On Thu, Mar 18, 2010 at 07:02:24PM +0530, Jos Collin wrote:
> On Thu, Mar 18, 2010 at 06:48:04PM +0530, Jos Collin wrote:
> > On Thu, Mar 18, 2010 at 06:31:53PM +0530, sanalkumar
mr wrote:
> > > Dear all......I' ve to convert a passport size photo
to stamp size. I tried
> > > $ convert -resize 51x37 sanal.jpg san.JPEG
> > > giving a low quality image.Any option to get a good
quality image...?
> > > And the properties of the input image is given below
> > > $ identify sanal.jpg
> > > sanal.jpg JPEG 260x300 260x300+0+0 DirectClass 8-bit
35.0488kb
> > > I also tried GIMP that also was in vain.Thanks in
advance....Sanalkumar
> > > --
> >
> > Hello Sir,
> >
> > I believe that the option -quality is what you need.
> > $convert -resize 51x37 -quality 80% sanal.jpg san.JPEG
> > This will retain 80% picture quality.
> >
>
> I'm sorry. I don't know whether -quality will increase
or decrease the
> compression level. I think by adjusting the value
(percentage) you can
> solve your problem.
>
I have verified that the following gives the maximum
picture quality.
$convert -resize 51x37 -quality 100% sanal.jpg san.JPEG
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