Use the crop tool but make sure to leave the resolution box blank, otherwise it will resample. Just enter your H and W in inches in the proper aspect ratio. (do not enter h and w in pixels, this will resample your image.) 

You can also use the marquee select tool and then the Image/crop command. 

"Liotcik" <liotcik@gmail.com> wrote in message news:hdqfb9$ful$1@trimpas.omnitel.net...
> Sveiki, kai naudoju crop tool photoshope, reikia ivest nuotraukos dydi (cm 
> ar in), priklausomai nuo originalo photoshopas prideda arba nuima pixelius 
> tam kad nuotrauka atitiktu uzduota dydi. Manes si funkcija netenkina, noriu 
> kad iskropinu's nesikeistu pixel'iu skaicius, t.y. tarkim turim nuotrauka 
> 100x100pix ir jei as puse nu'crop'inu, noreciau gaut 100x50pix, o ne kazka 
> kita.
> Gal galetumet paaiskint kaip ta padaryt.
> 
>