Jump to content
Sign in to follow this  
Kennethchase

Compress tif file

Recommended Posts

Without loss in quality? No. Any compression will have 'some' impact on quality. It really depends how much you regard as acceptable.


IPad Pro 10.5 512GB iOS 12.1 Affinity Photo 1.6.11.85 Affinity Design 1.6.4.45

Share this post


Link to post
Share on other sites
9 hours ago, Kennethchase said:

If I have a tiff that is 50 mb. Can I compress to 25 without loss in quality?

if so.....how?

thanks

It depends.

Tiff files can be uncompressed or compressed, it depend on where they came from.

Some software (like Affinity) uses LZW compression as standard. LZW is a bit like Zip files, it does not lose quality. However, sometimes the compression amount is tiny, like from 50 mb to 49 mb. It depends on what is in the image.

If you don't know, load the file into Affinity and Export it as a Tiff, if it gets smaller the original was uncompressed. If you have already saved it from Affinity, then there is nothing more that can be done except saving as JPEG which will lose a tiny bit of quality, but at 85% - 90% quality, it is unlikely anyone will ever know


Windows PCs. Photo and Designer, latest non-beta versions.

Share this post


Link to post
Share on other sites
10 hours ago, DM1 said:

Without loss in quality? No. Any compression will have 'some' impact on quality. It really depends how much you regard as acceptable.

Not true, in general. Some compression methods are truly lossless. LZW, for example, which is the standard for TIFF compression.

Edit: it may be true that compressing from 50MB to 25MB without loss of quality is not possible, but that's a specific situation.


-- Walt

Windows 10 Home, version 1809, 16GB memory, Intel Core i7-6700K @ 4.00Gz
Affinity Photo 1.6.5.123 and 1.7.0.258 Beta
Affinity Designer 1.6..5.123 and 1.7.0.258 Beta
Affinity Publisher 1.7.0.270 Beta

Share this post


Link to post
Share on other sites

Thanks Walt. I put my pic in photoshop but nothing happened when I tried to compress choosing LZW. The options were grayed out. I guess my only option

is to lower the ppi, which I hate to do.

Share this post


Link to post
Share on other sites

What are your image dimensions (in pixels), what is the intended use, and what is the DPI setting currently?

(By the way, TIFF images exported from Affinity Photo are automatically compressed using LZW.)


-- Walt

Windows 10 Home, version 1809, 16GB memory, Intel Core i7-6700K @ 4.00Gz
Affinity Photo 1.6.5.123 and 1.7.0.258 Beta
Affinity Designer 1.6..5.123 and 1.7.0.258 Beta
Affinity Publisher 1.7.0.270 Beta

Share this post


Link to post
Share on other sites
17 hours ago, walt.farrell said:

Edit: it may be true that compressing from 50MB to 25MB without loss of quality is not possible, but that's a specific situation.

and the one to which I was replying. :)


IPad Pro 10.5 512GB iOS 12.1 Affinity Photo 1.6.11.85 Affinity Design 1.6.4.45

Share this post


Link to post
Share on other sites

Walt: one example. 4200x4200 pixels, 14”X14” image size . 300 dpi.

i want to place my work for sale on FineartAmerica website and they will

only accept files smaller than 25 mb.

they suggest converting to jpeg but when I do this in photoshop the 

file size stays the same 50 mb. Can I achieve this in Affinity? I’ve looked and

dont see how.

thanks a lot

Share this post


Link to post
Share on other sites
4 hours ago, Kennethchase said:

they suggest converting to jpeg but when I do this in photoshop the 

file size stays the same 50 mb. Can I achieve this in Affinity? I’ve looked and

dont see how.

If the filesize of a JPEG file stays the same, that sounds like perhaps you're choosing too high a JPEG quality level, or you need to reduce the pixel dimensions of your photo significantly (i.e.,  don't have it be a 14" x 14" image). I know that neither approach will seem reasonable to you, but the limitation is really one imposed by FineartAmerica and that sounds like a consequence of wanting to do business with them.

In any case, Affinity Photo would have roughly the same limitations as Photoshop.

One other thought: what is the color format of your file? If I make an RGB/8 file with those dimensions and save as a TIFF it's only 15+ MB.


-- Walt

Windows 10 Home, version 1809, 16GB memory, Intel Core i7-6700K @ 4.00Gz
Affinity Photo 1.6.5.123 and 1.7.0.258 Beta
Affinity Designer 1.6..5.123 and 1.7.0.258 Beta
Affinity Publisher 1.7.0.270 Beta

Share this post


Link to post
Share on other sites

Walt: one example. 4200x4200 pixels, 14”X14” image size . 300 dpi.

i want to place my work for sale on FineartAmerica website and they will

only accept files smaller than 25 mb.

they suggest converting to jpeg but when I do this in photoshop the 

file size stays the same 50 mb. Can I achieve this in Affinity? I’ve looked and

dont see how.

thanks a lot

Share this post


Link to post
Share on other sites

RGB/8 is shorthand for RGB (8 bits per pixel), which is one of the standard color formats for images.

Edit: Note that I do not use an iPad, so I can only provide screenshots from Windows. Sorry.

If you have your image open in Affinity Photo, and have the View Tool (Hand) selected, you'll see your document's color format in the context bar. For example, this screenshot is from a document in the RGBA/16 format (RGB with 16 bits per pixel):
colorsetting1.png.556d6184f8543c719b2263959ed65261.png

You can also see your color format via Document > Color Format. Here's one where the document is RGB/8:

colorsetting2.png.c2c408312c9ac58c0a0557205dfad738.png

Question: what color format is your document?


-- Walt

Windows 10 Home, version 1809, 16GB memory, Intel Core i7-6700K @ 4.00Gz
Affinity Photo 1.6.5.123 and 1.7.0.258 Beta
Affinity Designer 1.6..5.123 and 1.7.0.258 Beta
Affinity Publisher 1.7.0.270 Beta

Share this post


Link to post
Share on other sites

Thanks. When I followed your directions what I found was the doc was already

rgb8. I did however lower the quality setting before exporting to iPhoto.

when I opened in photoshop the file was still the same 50mb+. There must be some

incompatibility issue with photoshop. It’s the only thing I can think of.

one more question you may be able to clarify. If I lower the ppi from 300 to 200

after the original was created at 300 will it be the same quality if the original was created at 200? Thanks again.

Share this post


Link to post
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now
Sign in to follow this  

×