Predetermined Image export size in LR CC

This is a question about an image (under the direction of RAW) export to jpg and make my best determine in advance the size effective download by manipulating the dimensions or by other methods.


This isn't a question about printing.

I do not understand the difference between a white wall of shooting and the shooting of a colorful scene, about the size of the image.   I also know that edit heavily in Lightroom and Photoshop affect the final size of the image too.

But I have a problem with manages the output size after cropping.    And speaking of cropping - I can I export a single file in three sizes different cultures using the same size for the "long" side is not an effective tool.

For an online location, I am limited to 1500 KB in total size and less than 16 000 000 pixels or 4 000 x 4 000.    For other places online, I need different limitations.     "So what I'm trying to do, is just get"firm"to approximate predetermined maximum file size and keep my guess and ' re - download" to a minimum.

Here's what I know...

With the help of an image (a picture actually... these numbers are approximate)... Unlimited use 300 PPI resolution JPG uploaded can be 8 000 Ko, so there is a lot of data to work with! Using the 'Limit of the file size' feature, I can enter "1500 Kb or less"; let the 'empty' dimensions and I get a file that is 600 Kb or less.     Then, thinking as a semi -intelligent person of , (which may be wrong), I might jump "limit file size" up to 2500 KB, but then who can give me a file 1700 KB, which is too big!  The next step could be to reduce the 'limit file size' to 2200 k and I could still end up with a size of 750 Kb.   There seems to be no rhyme or reason by using the function "limit of the file size!   


Using a cropped file of 8 x 10 finished, I could suggest the long side to 1,000 KB and leave blank the 'Limit of the file size' category and the second length.   This often falls within a reasonable range of 1200 Kb.  But who is never guaranteed, and of course it changes when I use sizes of different cultures and radically changed if I edited heavily in Lightroom or PhotoShop.


INFO: I usually default to 120 DPI for the resolution, but I can change this if necessary. I know that 72-96 would be nice.   And maybe that's my problem?   Should I be picking 72 or 96 always for online use?      



Any suggestions?

The result is, I am looking for some consistency... or, better yet, a math formula?

Thanks in advance!

The file size is not a good indicator of JPG quality.

The "limit of the file size" is just another way to define the compression setting. You choose the maximum size you want and figures LR what compression setting gets you something 'just' under that number.

One thing to note here is that while LR has a 'quality' slider that goes from 1 to 100, in reality there are only about 12 real compression levels. This means that your file size limits are much less granular than you think.

A good read:

Blog of Jeffrey Friedl 's"an analysis of Lightroom JPEG export quality settings

When I export a file, based on the intended use, I take the pixel dimensions and the compression setting. Based on this, I have a vague idea of megabytes to the size of the file due to the experience, but as long as it is in the reasonable expectations of the real MB do not matter. Now obviously some sites place a limit on the size of pixel or MB of images they host or link to. In these cases, I adjust my settings of export accordingly.

Tags: Photoshop Lightroom

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