File sizes

[V6GTO]

Question:- A lot of my TIFF files (8 bit)from the 20D are around the 24 MB size.The photo bank I am talking to want files around the 48 MB size. It is easy to re-process the RAW files I have in 16 bit to give me the file size I want, but is it possible to increase (double) the file size of the images where I no longer have the RAW files, just the 24 MB TIFFs?

Martin.

PS - Yes, I know I am a dipstick for deleting the RAW files

[_dobbo_]

If you do double the file size of the TIFFs it isn't increasing quality in the slightest so what's the point?

[V6GTO]

_dobbo_ said:

If you do double the file size of the TIFFs it isn't increasing quality in the slightest so what's the point?

To get the photo bank to accept them, ergo, I might earn a few bob

Martin.

[_dobbo_]

Ah, I see!

Hmm.... The only thing I can think would be to increase the resolution to 200%, but I'm not sure what effect that would have on quality. I suspect someone else will have a better idea!

[nick francis]

Martin, I must have missed something in the manual but I thought the top end file options for the 20D were either large JPG ( 4000kb ish) or CR2 (8000kb ish) I didnt think it would record TIFF files (like my wife's Olympus will)

If it can I'd appreciate advice as to how do you set it up to do so.

TIA
Nick

[Ian_H]

nick francis said:

Martin, I must have missed something in the manual but I thought the top end file options for the 20D were either large JPG ( 4000kb ish) or CR2 (8000kb ish) I didnt think it would record TIFF files (like my wife's Olympus will) If it can I'd appreciate advice as to how do you set it up to do so. TIA Nick

The 20D can't save files in TIFF format but when you process your RAW files you can save them as either .jpg, TIFF or any other format for that matter


Cheers
Ian

[V6GTO]

nick francis said:

Martin, I must have missed something in the manual but I thought the top end file options for the 20D were either large JPG ( 4000kb ish) or CR2 (8000kb ish) I didnt think it would record TIFF files (like my wife's Olympus will) If it can I'd appreciate advice as to how do you set it up to do so. TIA Nick

You are right, Nick, it records in Jpeg or CR2. The Tiff files I have are files processed in Rawshooter essentials.

Martin.

PS - for anyone else thinking of getting a 1D II N, Rawshooter essentials and PS (CS2 or older) will not support the new Canon RAW files ( _MG_ ). You'll need to get Rawshooter Premium for the job. Think that goes for the 5D too.

>> Edited by V6GTO on Thursday 24th November 20:01

[Ian_H]

V6GTO said:

PS - for anyone else thinking of getting a 1D II N, Rawshooter essentials and PS (CS2 or older) will not support the new Canon RAW files ( _MG_ ). You'll need to get Rawshooter Premium for the job. Think that goes for the 5D too. >> Edited by V6GTO on Thursday 24th November 20:01

There is an update available for CS2 to allow it to handle RAW files from the 1DMKII N and other cameras, it's only a beta version at present so the final release should be along shortly

www.adobe.com/support/downloads/detail.jsp?ftpID=3155


Cheers
Ian

[Bee_Jay]

V6GTO said:

PS - Yes, I know I am a dipstick for deleting the RAW files

I've got some 35mm negatives you can burn if you like...

[HankScorpio]

Take a look at something like Genuine Fractals, I had some great success a while ago with it.
I got it from Lizardtech but they must have sold it, it's now this lot:
www.ononesoftware.com/download.php

Pricey but very nice results.

[simpo two]

Such is the stupidity of basing decisions on file size.

Open the TIFF in PS and double the image size. No better quality of course, but it will make a gigantic file to keep them happy.

[V6GTO]

simpo two said:

Such is the stupidity of basing decisions on file size. Open the TIFF in PS and double the image size. No better quality of course, but it will make a gigantic file to keep them happy.

An answer at last...ta very much

Martin.

[beano500]

V6GTO said:

simpo two said: Such is the stupidity of basing decisions on file size. Open the TIFF in PS and double the image size. No better quality of course, but it will make a gigantic file to keep them happy. An answer at last...ta very much Martin.

You might want to consider other ways of increasing your pixel count, because as Simpo says your quality is going to be no better - in fact it is likely to suffer.

It depends how closely the agency will pick up on these things. Look through the technical requirements carefully. If it says they will only accept files which , say, have been upsized using something like Genuine Fractals, then they'll probably reject anything else.

(Personally I use SI Pro from Fred Miranda as a PS plug in - and, with one agency (who don't specify how a file should be increased) in particular, some files seem to be acceptable but some files they are very picky on the resulting artefacts! I'm sitting here wondering what to do about the files they have rejected at the mo.)

[ehasler]

In a few tests I've seen, Photoshop does as good a job as any specialised upsizing app, unless you're blowing them up really big (e.g., 400% upwards) when Genuine Fractals appears to be slightly better.

I've not tried this myself, but it is apparently better to upsize in several smaller steps rather than doing in all in one go.

[simpo two]

PS has several ways it can resample (well CS does) - bicubic, bilinear etc. Haven't done comparisons but you guys with the magnifying glasses might like to make comparisons to see whcih you like best?

[joust]

ehasler said:

I've not tried this myself, but it is apparently better to upsize in several smaller steps rather than doing in all in one go.

Agreed. The way that bicubic interpolation (my thesis for my degree was a image resolution enahancement plugin for a laser printer that took 300x300dpi rasterised output and upscaled it to 600x1200dpi) works it is "best" to do it in "n" steps where n = ROUND(SQRT((x2/x1)^2 + (y2/y1)^2)^1.5,UP)

where x1,y1 is the resolution of the original, x2,y2 is the resolution of the desired size.

So, if you want to double the size of the file, then you need to increase each sides resolution by 1.41, so the maths is

SQRT((141/1)^2 + (1.41/1)^2)^1.5, or SQRT(2+2)^1.5 = 2.82, or 3 steps when the round up function is applied.

So, if you have a 1200x1600 image that you want to double in size, then that needs to go to 1700x2266 and you should do that in three steps, or 166 pixels on the short side per step

So, you'd scale up, using normal bicubic interpolation

1200x1600 to 1366x1821
1366x1821 to 1532x2042
1532x2042 to 1700x2266

I'd bet my bottom dollar that you'd struggle to see the difference between that and these "pay for" plugins.

J

[GetCarter]

joust said:

n = ROUND(SQRT((x2/x1)^2 + (y2/y1)^2)^1.5,UP) where x1,y1 is the resolution of the original, x2,y2 is the resolution of the desired size. So, if you want to double the size of the file, then you need to increase each sides resolution by 1.41, so the maths is SQRT((141/1)^2 + (1.41/1)^2)^1.5, or SQRT(2+2)^1.5 = 2.82, or 3 steps when the round up function is applied.

This of course, is what I have always suspected.

[GetCarter]

By the way... 'who you calling a SQRT?

[beano500]

You just made that up!






Didn't you?



I would say "you learn something new every day" but I think I may need some more time on this one!

[beano500]

joust said:

I'd bet my bottom dollar that you'd struggle to see the difference between that and these "pay for" plugins.

...and I think you're quite right becaue all they do is perform the action automatically along with a bit of sharpening and other magic tweaking between each stage.

(Worth it for the convenience factor if you have to do it quite often, though.)