Cropping problem.

[hullodare]

For some reason unknown to me a cropping problem has "cropped "up. When I put the pixels in the width and height box's to make a certain size crop.....say 200 pixels by 300 pixels....when I execute the crop the image blows up in size a little (in other words when I crop the image...the image gets a little bigger and distorts somewhat). How do I fix this problem?

[George Austin]

Hullodare,

Entering crop size in PIXELS changes the old ballgame COMPLETELY.

With pixels as the unit of measure, leaving the resolution box blank produces a resulting image with the same resolution (ppi) as the original image. Resampling is forced upon PS.

With inches, cm, etc (anything other than pixels), leaving the resolution box blank produces a resulting image with its "natural" resolution. That is, there will be NO resampling. Only the original pixels will be used. No new ones will be created. No old ones will be destroyed. The resolution in ppi will come out to be whatever is then dictated by the output crop size that you have specified and by the original number of pixels you have to work with. The larger you make the crop, the lower the resulting resolution, and vice versa. If the resulting resolution is satisfactory, you are finished. If it's too crude (pixellized) because it's too large, THEN you see if you can make it acceptable by upsampling (creating ersatz pixels by interpolating between "real" pixels.

George

[hullodare]

But I always leave the resolution box emtpy when I crop......yet it still blows thing up and pixelates after the crop.

[YrbkMgr]

What units of measure do you use for width and height?

[LenHewitt]

That will happen if your section of the image was previously LESS than 200px
x 300px.

When you enter pixel values you are telling Photoshop to MAKE the selected
area that size. If the selected area has less pixels than you have entered
then Photoshop will resample the image upwards, creating the additional
required pixels based on the value of the surrounding pixels. That will
result is a degree of image degradation.

If the selected area has MORE pixels than you have entered then Photoshop
will resample the image downwards, discarding some pixels. This will still
result in some image degradation, but less than in the previous case.

[George Austin]

"...But I always leave the resolution box emtpy when I crop......yet it still blows thing up and pixelates after the crop..."

The dimensions you specify via the crop tool are the OUTPUT image dimensions. No matter what you then frame with the tool in the image, the resulting image size will be the cropped size you have set.

[dave milbut]

set the rectangle marquee to 100x75 and the option bar to fixed size. click the image, position the marquee and select edit> crop.

[hullodare]

dave milbut......you win the jackpot. Your instructions were the answer. You just saved me a whole lotta time. Much appreciation to all those who assisted me.

[hullodare]

You are correct YrbMgr. I was freaking out last night and in all my excitement I somehow blew it regarding your instructions. You also win a gold medal. Many thanks.

[YrbkMgr]

:)

[dave milbut]

tony, sometimes I need to translate your "plain english" into geek speak for it to have an effect.

gr&d!
dave

[YrbkMgr]

Dave,

sometimes I need to translate your "plain english" into geek speak for
it to have an effect.




I know, I know. And I work so hard at being articulate too... sigh.

[dave milbut]

I have to work hard at obfuscating. We're complimentary!

[YrbkMgr]

Ying and Yang friend... or is it Cat Dog?

[dave milbut]

mutt and jeff.