If you use Photoshop 'Export As' feature, you will be able to vary the key variables and see the expected file size before committing to the export. In this example, changing the quality(1) to 60% and pixel width (2)to 2000 pixels reduced the size from 27 Mb to 1.3 mb (3). If you do not have Ps you will have to do a trial and error in Lr Export. I have never been happy with how Lr works when setting a max output size.
I never use PS for exporting or printing - I use LR ... will have to look into this if it can't be done in LR ... thanks!
I use Lr 99% of the time. The odd time it is useful to be aware of this function in Ps, either you want to interactively create a jpg /png, etc or you just happen to be working in Ps.
It is also useful to know you can set your default export settings in Ps Export Preferences , so you can do a quick Export As Jpg with minimum keystrokes. ZenonDid you turn it off and on again?
I found that new Export As feature cropped my images a few times. For MetaData there are only choices for None or Copyright and Contact info. I find Save for Web Legacy is quicker and has more options. I as well have started using LR most of the time. Until about 6 months ago I still did export sharpening for my hobby shots using PS. 
Why are we suddenly talking about Photoshop? This is a Lightroom question and the Export dialog in Lightroom is perfectly adequate for this. You can set the maximum size in KB, but then of course you have to know that 2 MB = 2,048 KB, not 200,000 KB...
Ooops - I knew I shouldn't have dropped math in high school - thank you!
How come if I set the limit at 2048 K the files come out various sizes under 2 MB? These are large PSD files I'm exporting to jpgs ...
The PSDs might be multi layers and uncompressed AND even 16bit color. The JPEGs are going to be a (flattened) single layer, 8 bits of color and a lossy compressed file. Don't concern yourself with the size of the original, concern your self with exporting the best quality file that fits your size constraints. There are 12 levels of compression in the 0-100 quality range. in the export "File settings" section, you "Limit the file size to nnnnKB" Lightroom will pick the compression level necessary to deliver the proper size export.
But what I'm saying is LR is not making a 2MB file even though I've limited file size to 2048 KB ... one file was around 1.40 MB and another 1.26 MB ... quality set at 100
So, you have succeeded in .creating file less than 2MB (2048Kb) Lossy compression always exists in JPEGs. It is the nature of the format Anything in LR with a Quality setting between 92 -100 is at a compression level of 12 (the least compression available in the JPEG format. There are many components that determine the size of the PSD. I listed them above. The JPEG is restricted to an 8 bit color, lossy compressed single (flat) layer image. If you leave the "Limit the file size to nnnnKB" unchecked, Lightroom will still produce one file of 1.40 MB and another of 1.26 MB.
I understand the PSDs are varying sizes and yes I have many layers, 16 bit. So what you are saying is there is no way in LR to guarantee you are exporting a 2MB jpg ...
If you are using the maximum quality setting. then the size of the compressed file is entirely determined by the compression algorithm. What is so sacrosanct about 2MB? The resulting exported JPEG still has the same number of pixels as the original. And that is the intention. The size constraint is an outside artificial upper limit to probably meet some bandwidth limitation.
No. This is the maximum size, not the target size. But why is that important? If Lightroom can produce a good quality JPEG with a size of only 1.4 MB, why would you want it to be bigger?
Just trying to fulfill a request for a submission ...
The submission requires an exact size?... That is foolish at best.
Can you post the actual submission request spec. We may be able to provide a more focused answer. If an organisation is trying to limit the size of a submission it is best to specify the max pixels on the longest side and maybe a quality setting (say of 80%).
That request is the Maximum size accepted. You've met their requirements by producing a smaller file
They accepted the smaller sizes ... they don't know what they are really asking for I guess ... thanks for your help!
For all those that have heard of the magazine "Arizona Highways", they require a 2MB image to appear in their Photo of the Day and they really do know what they are asking for. Just a heads up
For all those that have heard of the magazine "Arizona Highways", they require a 2MB image to appear in their Photo of the Day and they really do know what they are asking for. Just a heads up |
Export ภาพจาก lightroom ให ม ขนาด 3 mb ข นไป
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