image size

P
Posted By
pepe
Jun 3, 2006
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776
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hi,
I’ve a file 8bit, monolayer, in image size it is 77mega, but it hosts 144 mega on the hd, why?

thx a lot

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2
2
Jun 3, 2006
"pepe" wrote in message
hi,
I’ve a file 8bit, monolayer, in image size it is 77mega, but it hosts 144 mega on the hd, why?

PS files store additional information for you. In addition, any file is likely to be larger than RAM size due to the HD cluster factor. Disc space is cheap. No worries.
T
Tacit
Jun 3, 2006
In article <4481af41$0$36925$>,
"pepe" wrote:

I’ve a file 8bit, monolayer, in image size it is 77mega, but it hosts 144 mega on the hd, why?

Is it layered? Does it contain alpha channels? How are you saving it on your hard disk–in what format?

If you save a single layer file in .psd format and you turn on the "maximize compatibility" option, you can double the size. In English, "maximize compatibility" means "save two copies of the picture–one copy in regular Photoshop format ond one copy in Photoshop 2.0 format, both in the same file, in case you want to open the picture using Photoshop
1.0 or Photoshop 2.0."


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2
2
Jun 3, 2006
"pepe" wrote in message
"2" ha scritto nel messaggio

PS files store additional information for you. In addition, any file is likely to be larger than RAM size due to the HD cluster factor. Disc space is cheap. No worries.

ok but if i want to burn them into a dvd, they’ll be 77mb or 144?

I’d need to know what the cluster-factor is for a DVD. I never worried about it before to check.
P
pepe
Jun 3, 2006
"tacit" ha scritto nel messaggio
In article <4481af41$0$36925$>,
"pepe" wrote:

I’ve a file 8bit, monolayer, in image size it is 77mega, but it hosts 144 mega on the hd, why?

Is it layered? Does it contain alpha channels? How are you saving it on your hard disk–in what format?

no layer, no alpha, saved as tiff
tiff has not the max compatibility option, has it?

thx
P
pepe
Jun 3, 2006
"2" ha scritto nel messaggio
"pepe" wrote in message
hi,
I’ve a file 8bit, monolayer, in image size it is 77mega, but it hosts 144 mega on the hd, why?

PS files store additional information for you. In addition, any file is likely to be larger than RAM size due to the HD cluster factor. Disc space is cheap. No worries.

ok but if i want to burn them into a dvd, they’ll be 77mb or 144?

thx
P
pepe
Jun 3, 2006
"pepe" ha scritto nel messaggio
hi,
I’ve a file 8bit, monolayer, in image size it is 77mega, but it hosts 144 mega on the hd, why?

OK, solution:

if I flatten image my layer 0 gets locked and the file becomes really 77mb….

why???
N
nomail
Jun 3, 2006
pepe wrote:

"pepe" ha scritto nel messaggio
hi,
I’ve a file 8bit, monolayer, in image size it is 77mega, but it hosts 144 mega on the hd, why?

OK, solution:

if I flatten image my layer 0 gets locked and the file becomes really 77mb….

why???

Because ‘Layer 0’ means that the file *is* layered, even though you only see one layer.


Johan W. Elzenga johan<<at>>johanfoto.nl Editor / Photographer http://www.johanfoto.nl
2
2
Jun 3, 2006
"Johan W. Elzenga" wrote:

Because ‘Layer 0’ means that the file *is* layered, even though you only see one layer.

Now this is confusing. I have noticed that if I have only the background layer, and alt-click on it to make it a regular layer, file size grows.

Just another mystery.
T
Tacit
Jun 3, 2006
In article ,
"2" wrote:

PS files store additional information for you. In addition, any file is likely to be larger than RAM size due to the HD cluster factor. Disc space is cheap. No worries.

None of that will account for a doubling in size of a 77MB file. The clustering factor even on an old FAT16 volume is never more than 64 kilobytes max, and Photoshop’s metadata typically adds no more than 15 kilobytes or so to file size. None of this can account for the extra 77 MB.

I suspect the problem is in the original poster’s choice of image options. "Save Image Pyramid" and "Layers," when checked in the TIFF output dialog, may double the file’s size.


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T
Tacit
Jun 3, 2006
In article ,
"2" wrote:

Now this is confusing. I have noticed that if I have only the background layer, and alt-click on it to make it a regular layer, file size grows.

It is not a mystery.

The file has layers. If you see Layer 0, the file has layers. It is a layered file and the number of layers happens to be 1.

You are instructing Photoshop to save a TIFF.

You are also telling Photoshop to save the file with layers in a TIFF. So Photoshop is saying "OK, I am going to write Layer 0. This layer is 77 MB in size. Now, I am going to write a second copy of the file flat, with no layers, because TIFF files with layers are not understood by other programs. I will now write a flat copy of the file as well. The flat copy is 77 MB. So the TIFF will now be a flat copy, 77 MB, plus a layered copy, 77 MB."

You can instruct Photoshop not to include layers in a TIFF file. This will make your TIFF smaller.


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2
2
Jun 3, 2006
"tacit" wrote in message

None of that will account for a doubling in size of a 77MB file. The clustering factor even on an old FAT16 volume is never more than 64 kilobytes max,

The larger the disc, the larger the cluster-factor. No?
2
2
Jun 3, 2006
"tacit" wrote in message
In article ,
"2" wrote:

Now this is confusing. I have noticed that if I have only the background layer, and alt-click on it to make it a regular layer, file size grows.

It is not a mystery.

The file has layers. If you see Layer 0, the file has layers. It is a layered file and the number of layers happens to be 1.

Hey. I just turn the background into a normal layer and do nothing and it’s an ADDITIONAL layer? That’s fucked.

You are instructing Photoshop to save a TIFF.

No I was not.
T
Tacit
Jun 4, 2006
In article ,
"2" wrote:

The larger the disc, the larger the cluster-factor. No?

Only up to a certain point. Every hard disk format has a maximum cluster size. Once that maximum size is reached, you can not format disks larger than that using that format.

For example, you can not format a volume larger than 2 GB using FAT16. It’s the maximum size that particular disk format permits. FAT16 permits a maximum cluster size of 32 kilobytes, no more; and a maximum number of clusters of 65,536, no more. Hence, as the disk gets bigger and bigger, the cluster size gets bigger and bigger–until the disk hits 2GB, past the point you can no longer use FAT16 at all.

Other had disk formats have different limitations, but the same logic applies. Every hard disk format will have a maximum cluster size.


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T
Tacit
Jun 4, 2006
In article ,
"2" wrote:

Hey. I just turn the background into a normal layer and do nothing and it’s an ADDITIONAL layer? That’s fucked.

No. There is one layer, not two.

When you open an image that has only a background, it has zero layers. The background is not a layer.

When you turn the background into a layer, the file now has one layer. The background no longer exists, but a layer exists in its place. The size of the image is unchanged, but now it has layers.


Art, photography, shareware, polyamory, literature, kink: all at http://www.xeromag.com/franklin.html
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2
2
Jun 4, 2006
"tacit" wrote in message
In article ,
"2" wrote:

The larger the disc, the larger the cluster-factor. No?

Only up to a certain point.

Right. It’s "up the point" that you understand. In principle, the larger the disc, the larger the cluster factor. Period. It will always be that way. Get over the little stuff, Tacit.
BV
Bart van der Wolf
Jun 4, 2006
"2" wrote in message
SNIP

Get over the little stuff, Tacit.

the ‘little stuff’ matters …

Bart
D
Dave
Jun 4, 2006
On Sun, 04 Jun 2006 00:07:52 GMT, tacit wrote:

When you open an image that has only a background, it has zero layers. The background is not a layer.

This was important mentioning this; suddenly it is understandable – at least to us who saw the background as a layer. And I doubt that we are the minority:-)

When you turn the background into a layer, the file now has one layer. The background no longer exists, but a layer exists in its place. The size of the image is unchanged, but now it has layers.

Dave
T
Tacit
Jun 4, 2006
In article ,
"2" wrote:

Right. It’s "up the point" that you understand. In principle, the larger the disc, the larger the cluster factor. Period.

That is true only of file systems that have fixed-size allocation tables.

Older file systems work this way. FAT16 divides a disk into 65,536 allocation blocks, so the bigger the drive is, the bigger each allocation block is. Divide the size of the drive by the size of the allocation table and oyu’ll get how big the clusters are.

Some modern file systems do not have fixed-size allocation tables. As a result, when the hard drive grows in size, the allocation table grows in size–but the cluster size stays the same. So it is not always true of all file systems that bigger hard drives mean larger clusters.


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P
pepe
Jun 5, 2006
"Johan W. Elzenga" ha scritto nel messaggio
pepe wrote:

"pepe" ha scritto nel messaggio
hi,
I’ve a file 8bit, monolayer, in image size it is 77mega, but it hosts 144
mega on the hd, why?

OK, solution:

if I flatten image my layer 0 gets locked and the file becomes really 77mb….

why???

Because ‘Layer 0’ means that the file *is* layered, even though you only see one layer.

perfect,

thx a lot to all fo you

🙂

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