Tiff vs Jpeg

[persius007]

I'm trying to sort out an issue so I am requesting some advice please.   I have some images which were rendered out as Tiff files.  If somebody needs to know why it's because the 3D program being used does not save out as jpeg.

I would like to make some changes in Photoshop to the tiff images but I'm unable to use the "Brightness Contrast" feature because it's grayed out.   Is there a way to adjust the Brightness on a Tiff image?  

Secondly.  When posting images onto a website, I'm going to guess that jpeg is the preferred format so how can I change tiff to jpeg?  I don't have that option in Photoshop.  If it means anything, the version of Photoshop being used currently is CS3.

Thank you.

[Mike_Gondek]

jpeg is the file format for web browsers, I would also recommend looking into .png.

In CC2018 brightness & contrast works on 16 bit imagegs.  With an old CS3  version my guess is you are in 16 bit and changing to 8 bit will fix your issue.

[davescm]

Hi

Are they 32 bit /channel images? Brightness and Contrast are not available in 32 bit/channel mode (Check in Image >Mode) . If you are just preparing these for web use then change to 16 bit or 8 bits/channel

To export for web use use File > Export > Save for Web (Legacy) and choose jpeg as the file format. Always check Convert to sRGB and Embed Color Profile

Dave

[Ussnorway]

everytime you do something to a jpeg a little bit of the image is lost... its a crappy file format and should not be used if you can avoid it

jpeg = small file transfer for sending on the internet... not store and edit later

Tiff is a better file format but its old and not used much now days

for 3d work i.e, textures and such I use bmp when doing any edits (because png textures have their own issues)

but png is the standard for stored image files

[Derek Cross]

To add to the previous post, after optimising etc, Save As and select JPG from the Format drop-down menu. For use on the web select a compression that’s lowest without too much image degradation, usually around 8.

[persius007]

Hello to all.

I really appreciate your time.  It's been a few years since I dabbled in desktop publishing so I became a bit rusty.

To begin, yes, the images are 32 bit so I changed that to 16 bit and it worked.    I will apply the rest of your suggestions this evening.

I would like to give everybody the "correct answer" but it only allows me to do it for one of you and I don't want to offend the rest.  Any suggestions? 

[Ussnorway · Accepted solution]

just mark one as correct and the others as helpful it will not upset people... most of us have no interest in the point system anyway and its more to say the thread question has been solved so other people searching for their issue know that you got an answer

[persius007]

Ok, fair enough
Thanks again for the help.