How to Maintain PPI upon export

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alang

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Hi

I am new to Lightroom so please bear with me. I have taken several photos that are 3''PPI and done some minor cropping then exported them. Everytime I export the photo dimensions expand such that the photos become 72PPI. Example

Original Photo: ARGB, 6.6mb, 3'92x47'8, 1'.3"x15.7"
Cropped and exported: ARGB, 38.8Mb, 2935x4622, 4'.8"x64.2"

I'm sure I am doing something blindingly stupid but for the life of me I cannot figure out what. I would like to have an image about the same file size and maintained at 3''PPI.

I am using Lightroom 1.3 on Windows. Any help or input here would be most appreciated.

regards,
AlanG
 
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What tool are you using to determine the sizes?

What are your settings in the export dialog? Are both the original and the exported file JPEGs?

It would appear that the crop is working -- the pixel dimensions are smaller. So that's why I'm curious about the file formats, to explain the difference in megabytes.
 
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alang said:
Hi

I am new to Lightroom so please bear with me. I have taken several photos that are 3''PPI and done some minor cropping then exported them. Everytime I export the photo dimensions expand such that the photos become 72PPI. Example

Original Photo: ARGB, 6.6mb, 3'92x47'8, 1'.3"x15.7"
Cropped and exported: ARGB, 38.8Mb, 2935x4622, 4'.8"x64.2"

I'm sure I am doing something blindingly stupid but for the life of me I cannot figure out what. I would like to have an image about the same file size and maintained at 3''PPI.

I am using Lightroom 1.3 on Windows. Any help or input here would be most appreciated.

regards,
AlanG
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When you export, if you look further down you will see a place to tell how much DPI you want (look for number 72 and change it to your taste). In the same "Image parameters" area, you can also set dimensions.

May I remind you that DPI (or PPI) are meaningless to Lightroom and/or screens/displays?... They just use pixel counts as in your 2935x4622 example. DPI are just used for paper (print/scans).

Welcome,
 
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Hi

Thanks for the responses. I am working with JPEGs (original file) and am exporting as a JPEG as well. Export settings as follows:

File Settings:
FORMAT: JPEG
QUALITY: 1''

Image Settings:
COLORSPACE: AdobeRGB
RESIZE TO FITE: unchecked
RESOLUTION: 3'' PPI
WATERMARK: unchecked

Metadata
all unchecked

Post Processing
do nothing

Perhaps I have to check "Resize to Fit" and force the image to the new cropped pixel width and height?

Regards,
AlanG
 
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What program are you using to read the files once they're exported?
 
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Hmmm - indeed a good question. I have been looking at the image data in IrfanView 4.1.' and looking at image<information - Please see a 1 pg PowerPoint attached showing the image data before the cropping/exporting and after (note - the extension of the file needs to be changed from .txt to .ppt before it will open). It strikes me that the DPI (because it is blank for some reason) is being defaulted to 72 and being used to calculate the image size - perhaps? It also makes me wonder why the image size (MB) increases and the # of unique colours drops?

Rob, I don't think I can upload the exported JPG - I do not own the image (it is the property of a family member). It is also fairly large to upload I think.

thanks,
AlanG
 
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