Image size

[davetucker]

Hi
I Shoot in raw, then process in Lightroom, once finished I export the file as a jpeg, to my desktop, at this stage the file size is between 2.5 & 3.5mb then if I go into Photoshop, and then view the file size, in the "Image Size" option the file is often >30mb, but when I export out of Photoshop the file size is again exported at 2.5 to 3.5mb. How do I export the largest file size to satisfy the needs of "Alamy"????

 

[Chappers]

You can specify file size within the export module from within Lightroom. Just work out what pixel dimension you want, possibly something around 5,000 on the longest size. ( probably best to just select the longest size anyway)

It's the uncompressed size that Alamy want so its the image size in Photoshop you want to be aware off, not the compressed JPEG.

 

[PhotoTalk]

As above. I got help from awp on another thread with the same thing:

What I do is process the RAW in Lightroom - then export as a jpeg at 300dpi up sized to 5050 pixels longest side - that - almost always - gives an uncompressed jpeg of 48+meg. 48meg is the minimum for Alamy - don't get confused with the size of file you actually send them - that might be 12 - 15 meg - but that is the compressed jpeg file size NOT the image size. If you need more help let me know.

 

[Freester]

Hi
I Shoot in raw, then process in Lightroom, once finished I export the file as a jpeg, to my desktop, at this stage the file size is between 2.5 & 3.5mb then if I go into Photoshop, and then view the file size, in the "Image Size" option the file is often >30mb, but when I export out of Photoshop the file size is again exported at 2.5 to 3.5mb. How do I export the largest file size to satisfy the needs of "Alamy"????

Hmm this could get confusing.

Basically when you export as JPG it is compressed.

So if you are shooting in RAW your best workflow is to right click in Lightroom after making any levels / sats corrections, and select the 'Edit in Photoshop' option. You will be given an option whether to use PSD (Photoshop) or TIFF format. I think Alamy want TIFF so use that.

Some good advice on the Alamy web help as to how to upsize to 48-50MB as requested, then in Photoshop 'save as' TIFF.

(Or buy a 7D that will give a file of about the right size when you save as a TIFF )

 

[swag72]

I found that 5117 was the pixel size on the longest length to get the correct size file for Alamy.

 

[Paul MR]

Here is a Photoshop script that will make the document 50meg uncompressed if it less than 50meg.

if(documents.length){
resizeToFiftyMeg();
}

function resizeToFiftyMeg(){
var SizeOfFile = 50; //This is the actual size required.
var current_units = preferences.rulerUnits; 
preferences.rulerUnits = Units.PIXELS;  
var width_pixels = activeDocument.width; 
var height_pixels = activeDocument.height; 
var channel_count = activeDocument.channels.length; 
var image_bytes = width_pixels * height_pixels; 
var actual =((image_bytes/1024/1024)*channel_count).toFixed(2);
if(actual >= SizeOfFile) return;
var final_size = ( 1024 * 1024 * SizeOfFile ) / channel_count; 
var image_scale = Math.sqrt( final_size/ image_bytes ); 
var final_width = width_pixels * image_scale; 
var final_height = height_pixels * image_scale; 
var final_ppi = activeDocument.resolution;
activeDocument.resizeImage( final_width, final_height, final_ppi, ResampleMethod.BICUBICSMOOTHER );
preferences.rulerUnits = current_units; 
}

 

[davetucker]

Here is a Photoshop script that will make the document 50meg uncompressed if it less than 50meg.

if(documents.length){
resizeToFiftyMeg();
}

function resizeToFiftyMeg(){
var SizeOfFile = 50; //This is the actual size required.
var current_units = preferences.rulerUnits; 
preferences.rulerUnits = Units.PIXELS;  
var width_pixels = activeDocument.width; 
var height_pixels = activeDocument.height; 
var channel_count = activeDocument.channels.length; 
var image_bytes = width_pixels * height_pixels; 
var actual =((image_bytes/1024/1024)*channel_count).toFixed(2);
if(actual >= SizeOfFile) return;
var final_size = ( 1024 * 1024 * SizeOfFile ) / channel_count; 
var image_scale = Math.sqrt( final_size/ image_bytes ); 
var final_width = width_pixels * image_scale; 
var final_height = height_pixels * image_scale; 
var final_ppi = activeDocument.resolution;
activeDocument.resizeImage( final_width, final_height, final_ppi, ResampleMethod.BICUBICSMOOTHER );
preferences.rulerUnits = current_units; 
}

Hi Paul

Thanks for the code, What do I do with it??
Sorry, I have tried everything the largest size I can get in jpeg is 10mb

Dave:bang:

 

[JasonRS]

Hi
f I go into Photoshop, and then view the file size, in the "Image Size" option the file is often >30mb

It's this number that matters, the uncompressed size, not the actual file size.