i’ve never seen it corrupt one when saving like that, but i usually use file> save for web because i have more control of the jpg output then when i use file> save as.
support told me in case #180459305 that doing that would corrupt the jpg
Either you misunderstood them, or they misunderstood you.
To be clear, saving a copy of a layered file as a JPG should NOT result in a corrupt file. I can just imagine the meeting where a feature like that might get rationalized. 😀
J
Hi, J:
Oh, no, the tech was *very* emphatic. However, let me ask the question in a slightly different manner:
If I save the layered PSD file as jpg, without first manually merging the layers, will this result in the same quality jpg image as if I had first manually flattened layers in the PSD file?
Thanks,
Fred
Fred,
It should be the same. I have never heard of this before and I can only assume that the tech is mistaken.
I’d love to hear his explanation for that (note I am not ac0okmputer "techie". I base my assumption on years of working experience as a graphic artist in Photoshop).
If I save the layered PSD file as jpg, without first manually merging the layers, will this result in the same quality jpg image as if I had first manually flattened layers in the PSD file?
Yes. End of story. The tech was wrong. It happens.
J
Hi, Ed, J:
Thanks for your responses!
His explanation was as follows:
Save the layered PSD as a jpg. When you do so, a yellow exclamation alert appears next to "layers" in the save dialogue box. He said this means that the file will be corrupted if it is saved.
Now I believe it means that layers will be merged during the process of saving as a jpg, and I said so. He said no, let me prove it to you:
Go to Image->mode-> and set 16 bits per channel. Then save as a jpg. You will notice that there is no way to save an image as a jpg. Now how the hell that proves his former point is beyond me.
Now for the biggest laugh of the day: he said (in case#180459305) that if you copy or rename files using the filesystem filemanager (e.g., the desktop or windows explorer), that it would open the file to copy or rename it and then rewrite it, thus cause lossy image degradation.
I told him (politely) that he was wrong – that renaming a file does not open it – it simply updates directory information about the file, and that copying a file (outside of photoshop) does a byte-for-byte clone of the file and does not degrade image quality.
Where do they get these purported "experts"????
Cheers,
Fred
Where do they get these purported "experts"????
10 for a buck out of a gumball machine, i sometimes think… 🙂
Jpegs do not support layers if you save a layered file without flattening you might lose some of the image. to save a jpeg of a PSD use SFW but you might have to reduce the file size.
Hi, Buko:
That is correct: jpgs do not support layers. However, what I have continually observed is that no layers or unusual image quality are lost when saving a layered PSD as a jpg.
In other words, photoshop automatically flattens layers during the process of saving as a jpg – and does so correctly.
Please let me know specifically how part of an image would be lost during this process.
Thank you,
Fred
Photoshop may not include all layers this has been an issue in the past. I for one would not save as a Jpeg without manually flattening the image. You on the other hand may enjoy flirting with fate.
I have never had an issue saving to jpg using the save as feature. After your are promted for the file name, the jpg options appear and you can then see in the layers that they have been flattened.
The only issue I could see (I never tried this) is when you try to save a file with hidden layers. It may be possible that those layers do not get saved. Again I am guessing, but I will be testing it to verify.
OK, I was right hidden layers do not get saved when saving as a jpg.
Why should they?
How could they?
In the past can’t remember which version saving a layered file only saved the background so it is something that I have avoided doing.
So me what is wrong with this practice. I have a multiple layer PSD files saved on my computer. I load that image in Photoshop, flatten the layers, save the JPEG. Now, I have the JPEG image and I still have the PSD file with all the layers. Is that a bad practice?
no. you’re flattening first. you’re controlling the situation. not guessing what photoshop will do. for more control use save for web…
Jim:
Dave is correct. That is also what the Adobe tech recommended. However my experience is that I have been successful simply saving the layered PSD as a jpg without flattening the layers first.
Dave:
One problem with Save For Web and Devices is that it forces jpg and gif resolution to 72dpi (ppi). Yet 96dpi is required for full quality display on modern monitors. You can confirm with by checking monitor screen settings (Windoze->start->control panel->display-> settings->advanced. LCD-type monitors will show 96dpi). The Adobe tech said the only way they will enhance that function is if enough people submit enhancement requests. (Search for "enhancement" on the Adobe website).
If we’re going to discuss this PPI issue in depth, let’s start a new thread.
Thanks!
Fred
Save For Web and Devices is that it forces jpg and gif resolution to 72dpi (ppi). Yet 96dpi is required for full quality display on modern monitors.
Wha?! Modern monitors?! SFW strips out any resolution data because an image destined for screen display has no concern about ppi. Distinguishing between 96 and 72 ppi is even further nonsense.
If we’re going to discuss this PPI issue in depth, let’s start a new thread.
Indeed. This kind of misinformation does not belong in this thread or any other thread on this Photoshop forum. 🙂
One problem with Save For Web and Devices is that it forces jpg and gif resolution to 72dpi (ppi).
no, it strips resolution info. there’s a difference. what you see when you open the file is what the program defaults to when it doesn’t find ppi information… and i think there’s an option to over-ride that in S4W, i could be wrong though…
. Yet 96dpi is required for full quality display on modern monitors.
bzzzt. sorry. that’s wrong.
The Adobe tech said the only way they will enhance that function is if enough people submit enhancement requests.
ah! there’s the problem. don’t listen to front line support! 🙂
Save For Web and Devices is that it forces jpg and gif resolution to 72dpi (ppi). Yet 96dpi is required for full quality display on modern monitors.
This has got to be the reddest of Herrings. As Jim mentioned SFW strips resolution data as it is unnecessary on the web. When you open a file with no resolution data PS defaults to 72ppi this however does not affect how the file displays on your monitor. just how a page layout application reads the information.
Indeed, you (all) are correct and I was wrong.
That’s why we get the big buck’s. B)
ooh! i can see my check coming in now!!! … ***woooooosh!*** that was it… XD
