JPEG and PNG import problem.

[gar]

151224-0858

JPEG and PNG import problem.

This was originally 800 x 480 and 121 kbytes in .jpeg.
As imported it is 467 x 280 and 26.4 kbytes.


a


The above was originally 800 x 480 and 43 kbytes in .png.
Now it is 467 x 280 and 26.7 kbytes.

.

 

[mgookin]

test 1

 

[mgookin]

test 2

 

[mgookin]

Test 1 above was done using the "Insert Image" icon on the WYSIWYG toolbar.

Test 2 above was done using the "Attachments" icon on the same toolbar.

On my drive and in both tests, it reports as 600x800 86.6kb but they display differently.

Another process which can be used is photobucket or similar but I've never done that so I can't advise on it.

gar: what are you trying to do?

 

[gar]

151224-1034 EST

mgookin:

These are photos of the modulated carrier current signal from a TED-1000 system.

I will try attachments.

Using attachment and the .png file:

There are limitations and compression occurs. On preview results do not look good.

.

 

[gar]

151224-1049 EST

mgookin:

Your second image done via attachement is 600 x 800 pixels and 88 kbytes.

.

 

[mgookin]

151224-1049 EST

mgookin:

Your second image done via attachement is 600 x 800 pixels and 88 kbytes.

.

and the first one (Test 1) was compressed to 75x100 2.1kb

 

[George Stolz]

I didn't realize the forum compresses images, in the past the onus was on the user to compress the image using their own means to get under the restriction...?

I'm on my phone at the moment, scared to even attempt anything.

Okay, I tried it...

 

[George Stolz]

Test

 

[George Stolz]

The first was using the toolbar, which compressed it yuckily, and he second was using the method below the post window. I'd say the bottom method looks better from here.

 

[gar]

151224-1724 EST

George:

Both your images are stored as 280 x 280 and are 7561 bytes in size. Something else is causing the difference in the displayed size on the screen.

.

 

[Smart $]

Just to throw some proper terminology at you guys...

downsample = reduce picture pixel count (extends to file if saved as such)
resize = display on screen at a different (usually lower) pixel count than the file
compress = reduce file size without reducing picture pixel count
lossy = a compression type that results in loss of picture clarity
lossless = a storage type which does not degrade picture clarity

 

[George Stolz]

That helps.

 

[GoldDigger]

FWIW, jpg (JPEG) is a lossy compression algorithm for which you can optionally select the amount of loss to get greater compression. PNG, on the other hand is a lossless compression format with generally good compression efficiency.