> I have an jpg image with 96 resolution on horizontal and vertical
> so  for every pixel I can do

> 96 pixel ------ 1 inch  ----  25.4 mm
> 1 pixel  ---- 0.010417 inch ----- 0.2645 mm

> so If I have 30 pixel it's 30 * 0.2645 (this in mm) ??

> There is another way to calculate it?

> Thanks in advance

> Pamela

> Hi Pam,

> I'm afraid you are doing something very dangerous here. Please check
> with your image and be sure all of them are taken with same distance
> between camera and faces.

> It is really harsh to say 96 pixel == 1 inch. If the camera move back
> for 1 meter, 96 pixel will not be 1 inch.

> But if you think that is not an issue, what you have is probably a
> right.

> cheers,
> yongkang

> On Jun 22, 12:18 pm, pam <papere...@gmail.com> wrote:
>> Hi all,
>> I'm working with images for face reconigition and I need to take some
>> mesures. I can get the measure like diference between pixels but I
>> need to do some calculation so I need the measures on mm so I would
>> like to know if I'm in the right way

>> I have an jpg image with 96 resolution on horizontal and vertical
>> so  for every pixel I can do

>> 96 pixel ------ 1 inch  ----  25.4 mm
>> 1 pixel  ---- 0.010417 inch ----- 0.2645 mm

>> so If I have 30 pixel it's 30 * 0.2645 (this in mm) ??

>> There is another way to calculate it?

>> Thanks in advance

>> Pamela