could anyone send me some sample images of 12or 16 bit monochrome thanks & regards Rajesh.D
12 bit images
Started by ●April 29, 2008
Reply by ●April 29, 20082008-04-29
>could anyone send me some sample images of 12or 16 bit monochrome > >thanks & regards >Rajesh.Dhello rajesh, is 12 bit circular grey scale image good enough? then this can be created just using c program. just one side question does bmp, jpeg, tiff, etc format support 12, 16 bits? if not then do one have to write in their own format? do u have monitors/displays to display 12 and 16 bit images? i think images captured by HD camera are still in 10 bit regime. Regards Bharat Pathak www.Arithos.com DSP Simplified DSP Design consultancy and training company.
Reply by ●April 30, 20082008-04-30
hi Bharat Pathak,
thanks you for your response.
> " is 12 bit circular grey scale image good enough?
> then this can be created just using c program."
What are circular grey scale images and how can
we create them.
>
> " just one side question does bmp, jpeg, tiff, etc
> format support 12, 16 bits?"
Tiff supports 12 bit images. I am currently
working on jpeg2000 standard which supports any bpp ranging
from 1 bit to 48 bit (color)or higher.
>
> "if not then do one have to write in their own format?"
> there are other formats like RAW which support 12 bpp and higher.
> do u have monitors/displays to display 12 and 16 bit
> images?
I think there are in medical imaging and defense applications.
>
> "i think images captured by HD camera are still in 10 bit
> regime."
i googled to find high end cameras and scanners which capture
12 bit and higher.
>
> regards
Rajesh Dachiraju
Reply by ●April 30, 20082008-04-30
hello rajesh, i am not able to understand what do you mean by monochrome images. You a 12/16 bit per sample Y(chroma) buffer? or what image format you need the image in? a simple 32 bit bitmap RGB image can be converted to a 8 bit/Y sample greyscale image very easily. you can find the RGB-YUV conversion on the net. regards aps>could anyone send me some sample images of 12or 16 bit monochrome > >thanks & regards >Rajesh.D > > > >
Reply by ●April 30, 20082008-04-30
On Apr 30, 12:10 pm, "aaac111" <aaac...@gmail.com> wrote:> hello rajesh, > > i am not able to understand what do you mean by monochrome images. You a > 12/16 bit per sample Y(chroma) buffer? or what image format you need the > image in? > > a simple 32 bit bitmap RGB image can be converted to a 8 bit/Y sample > greyscale image very easily. you can find the RGB-YUV conversion on the > net. > > regards > aps > > >could anyone send me some sample images of 12or 16 bit monochrome > > >thanks & regards > >Rajesh.Dany format , 12 bit greyscale (RGB also ok) but the bit depth of Y component should be 12 bit and not 8 bit.
Reply by ●April 30, 20082008-04-30
Do you need 12 bits for image quality or just to test some algorithm? If the latter is the case, given that the LSBs usually carry noise, why not fill 4 additional bits in a 8bit picture with random data? best regards, Andre rajesh wrote:> On Apr 30, 12:10 pm, "aaac111" <aaac...@gmail.com> wrote: >> hello rajesh, >> >> i am not able to understand what do you mean by monochrome images. You a >> 12/16 bit per sample Y(chroma) buffer? or what image format you need the >> image in? >> >> a simple 32 bit bitmap RGB image can be converted to a 8 bit/Y sample >> greyscale image very easily. you can find the RGB-YUV conversion on the >> net. >> >> regards >> aps >> >>> could anyone send me some sample images of 12or 16 bit monochrome >>> thanks & regards >>> Rajesh.D > > any format , 12 bit greyscale (RGB also ok) but the bit depth of Y > component > should be 12 bit and not 8 bit.
Reply by ●April 30, 20082008-04-30
On Apr 30, 5:06 pm, Andre <alod...@gmx.de> wrote:> Do you need 12 bits for image quality or just to test some algorithm? If > the latter is the case, given that the LSBs usually carry noise, why > not fill 4 additional bits in a 8bit picture with random data? > > best regards, > > Andre > > rajesh wrote: > > On Apr 30, 12:10 pm, "aaac111" <aaac...@gmail.com> wrote: > >> hello rajesh, > > >> i am not able to understand what do you mean by monochrome images. You a > >> 12/16 bit per sample Y(chroma) buffer? or what image format you need the > >> image in? > > >> a simple 32 bit bitmap RGB image can be converted to a 8 bit/Y sample > >> greyscale image very easily. you can find the RGB-YUV conversion on the > >> net. > > >> regards > >> aps > > >>> could anyone send me some sample images of 12or 16 bit monochrome > >>> thanks & regards > >>> Rajesh.D > > > any format , 12 bit greyscale (RGB also ok) but the bit depth of Y > > component > > should be 12 bit and not 8 bit.Ultimately i need one to test my algorithm for compression efficiency. Surprising to see that google hasnt yielded a single image.
Reply by ●April 30, 20082008-04-30
Hello Rajesh, I could create a 12 bit circular grey scale, but you will have to pay me for the time I spend. contact bharat at arithos dot com Bharat
Reply by ●April 30, 20082008-04-30
rajesh wrote: ...> Surprising to see that google hasnt yielded a single image.I'm not surprised. Most images are intended to be looked at with eyes. Eight bits produces all the monochrome shading that most people can appreciate or that most printing processes can reproduce. Jerry -- Engineering is the art of making what you want from things you can get. �����������������������������������������������������������������������
Reply by ●April 30, 20082008-04-30
On Apr 30, 10:03�am, Jerry Avins <j...@ieee.org> wrote:> rajesh wrote: > > � �... > > > Surprising to see that google hasnt yielded a single image. > > I'm not surprised. Most images are intended to be looked at with eyes. > Eight bits produces all the monochrome shading that most people can > appreciate or that most printing processes can reproduce. > > Jerry > -- > Engineering is the art of making what you want from things you can get. > �����������������������������������������������������������������������Hello Jerry et al, 8 bits usually works well enough to hold an image in its final presentation if being presented by the usual means like paper or LCD. Ultrahigh dynamic range displays are a different matter altogether. Most digital SLR cameras record data at 12 bits per channel in their raw modes. One (Nikon D3) is now offered that has 14 bits per channel! Since with this camera the dynamic range was not increased 4 fold, the resulting steps are closer together. This proves helpful in some cases. If the OP wants a 12 bit image, he should just go over to a photography forum like the ones on www.dpreview.com and ask. I'm sure many there will offer up an image or two. The question now is what format does he want. I doubt he wants a proprietary format which the raw files from DSLRs are offered. Someone could convert the raw to a 16 bit tif and he can go from there. Clay
