why jpg file size grows after Element 4.0 edited it?

Caloonese wrote:

I am using Photoshop element 4.0 on an iMac.

I downloaded a jsp file from the Internet which is about 35K in size. I edited it using Element 4.0.
The original image is about 490×400.
I cropped it to 1×1 aspect ratio.
Then I resized the image to 100×100 pixel
I saved the image as a jpg file again.
I picked all minimum settings.

The resulting file ended up a 90K in size.
Smaller image, bigger file?

I don’t know what tool created the original image.
But Element 4.0 could not repeat the compact size.

What happened?
What can I do to shrink the file?

It makes sense if you added detail to the image. I simple image of large areas of a single color will compress a lot, but more complex images, of even a smaller "size" will compress less.

—
Joseph Meehan

Dia ‘s Muire duit

"Caloonese" wrote in message

I am using Photoshop element 4.0 on an iMac.

I downloaded a jsp file from the Internet which is about 35K in size. I edited it using Element 4.0.
The original image is about 490×400.
I cropped it to 1×1 aspect ratio.
Then I resized the image to 100×100 pixel
I saved the image as a jpg file again.
I picked all minimum settings.

The resulting file ended up a 90K in size.
Smaller image, bigger file?

I don’t know what tool created the original image.
But Element 4.0 could not repeat the compact size.

What happened?
What can I do to shrink the file?

Hi.

I really don’t understand this one.

A 100×100 pixel image can not be more than 10K.

Do the multiplication.

There are not enough pixels for anything bigger.

Try it again.

I didn’t change the picture, only cropping and reduce size, so the pixel complexity could only go down.

If this made sense to me, I would not have posted this question. Perhaps it is a bug of Element 4.0, or the "Get Info" of Mac OSX is not truthful in reporting the file size.
Does Mac OSX pad the file regardless how small the contents take?

I have repeated the save several times and the results are the same.

On Feb 6, 8:41 am, "Roy G" wrote:

"Caloonese" wrote in message

I am using Photoshop element 4.0 on an iMac.

I downloaded a jsp file from the Internet which is about 35K in size. I edited it using Element 4.0.
The original image is about 490×400.
I cropped it to 1×1 aspect ratio.
Then I resized the image to 100×100 pixel
I saved the image as a jpg file again.
I picked all minimum settings.

The resulting file ended up a 90K in size.
Smaller image, bigger file?

I don’t know what tool created the original image.
But Element 4.0 could not repeat the compact size.

What happened?
What can I do to shrink the file?

Hi.

I really don’t understand this one.

A 100×100 pixel image can not be more than 10K.

Do the multiplication.

There are not enough pixels for anything bigger.

Try it again.

"Caloonese" wrote in message

I didn’t change the picture, only cropping and reduce size, so the pixel complexity could only go down.

If this made sense to me, I would not have posted this question. Perhaps it is a bug of Element 4.0, or the "Get Info" of Mac OSX is not truthful in reporting the file size.
Does Mac OSX pad the file regardless how small the contents take?
I have repeated the save several times and the results are the same.
On Feb 6, 8:41 am, "Roy G" wrote:

"Caloonese" wrote in message

I am using Photoshop element 4.0 on an iMac.

I downloaded a jsp file from the Internet which is about 35K in size. I edited it using Element 4.0.
The original image is about 490×400.
I cropped it to 1×1 aspect ratio.
Then I resized the image to 100×100 pixel
I saved the image as a jpg file again.
I picked all minimum settings.

The resulting file ended up a 90K in size.
Smaller image, bigger file?

I don’t know what tool created the original image.
But Element 4.0 could not repeat the compact size.

What happened?
What can I do to shrink the file?

Hi.

I really don’t understand this one.

A 100×100 pixel image can not be more than 10K.

Do the multiplication.

There are not enough pixels for anything bigger.

Try it again.

Hi, my apologies. I was being very stupid.

I was not allowing for there being 3 colour channels. A 100×100 pixel image will be 3 x 10,000 equals 30K.

Plus some extra data for Exif and the file format itself.

I have just experimented in Elements 4, on a PC, and a 100 x 100px image open on screen is 29.4K.
Read "Doc Size" in box at bottom left of Elements Window.

When that is saved as a Jpeg with Max Quality it ends up being 39K on disc.

When Saved for Web it ends up at Max Quality as 29K ( No exif).

Applying Compression (lower quality) to those images will reduce the on disc file sizes considerably, but they will still be 29.4K when open on screen.

Your original image would have had compression applied to get it to 35K on disc, but when open on screen it would have been 490 x 400 x 3 equals 588K.

So your cropping has reduced its size considerably, but your system does seem to be adding an awful lot of extra data.
Is it perhaps keeping a hidden copy of the original with the file?? Are you using the Organiser (or whatever the Mac version is), and is that adding data??

Roy G

Roy G wrote:

"Caloonese" wrote in message

I didn’t change the picture, only cropping and reduce size, so the pixel complexity could only go down.

If this made sense to me, I would not have posted this question. Perhaps it is a bug of Element 4.0, or the "Get Info" of Mac OSX is not truthful in reporting the file size.
Does Mac OSX pad the file regardless how small the contents take?
I have repeated the save several times and the results are the same.

I think that is the best comprehensive explanation I have read.

—
Joseph Meehan

Dia ‘s Muire duit