Kennethchase Posted September 24, 2018 Share Posted September 24, 2018 If I have a tiff that is 50 mb. Can I compress to 25 without loss in quality? if so.....how? thanks Quote Link to comment Share on other sites More sharing options...
DM1 Posted September 25, 2018 Share Posted September 25, 2018 Without loss in quality? No. Any compression will have 'some' impact on quality. It really depends how much you regard as acceptable. Quote M1 IPad Air 10.9/256GB lpadOS 17.1.1 Apple Pencil (2nd gen). Affinity Photo 1.10.5 Affinity Design 1.10.5 Affinity Publisher 2, Affinity Designer 2, Affinity Photo 2 and betas. Official Online iPad Help documents (multi-lingual) here: https://affinity.https://affinity.help/ Link to comment Share on other sites More sharing options...
toltec Posted September 25, 2018 Share Posted September 25, 2018 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 Quote Windows PCs. Photo and Designer, latest non-beta versions. Link to comment Share on other sites More sharing options...
walt.farrell Posted September 25, 2018 Share Posted September 25, 2018 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. Quote -- Walt Designer, Photo, and Publisher V1 and V2 at latest retail and beta releases PC: Desktop: Windows 11 Pro, version 23H2, 64GB memory, AMD Ryzen 9 5900 12-Core @ 3.00 GHz, NVIDIA GeForce RTX 3090 Laptop: Windows 11 Pro, version 23H2, 32GB memory, Intel Core i7-10750H @ 2.60GHz, Intel UHD Graphics Comet Lake GT2 and NVIDIA GeForce RTX 3070 Laptop GPU. iPad: iPad Pro M1, 12.9": iPadOS 17.4.1, Apple Pencil 2, Magic Keyboard Mac: 2023 M2 MacBook Air 15", 16GB memory, macOS Sonoma 14.4.1 Link to comment Share on other sites More sharing options...
Kennethchase Posted September 25, 2018 Author Share Posted September 25, 2018 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. Quote Link to comment Share on other sites More sharing options...
walt.farrell Posted September 25, 2018 Share Posted September 25, 2018 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.) Quote -- Walt Designer, Photo, and Publisher V1 and V2 at latest retail and beta releases PC: Desktop: Windows 11 Pro, version 23H2, 64GB memory, AMD Ryzen 9 5900 12-Core @ 3.00 GHz, NVIDIA GeForce RTX 3090 Laptop: Windows 11 Pro, version 23H2, 32GB memory, Intel Core i7-10750H @ 2.60GHz, Intel UHD Graphics Comet Lake GT2 and NVIDIA GeForce RTX 3070 Laptop GPU. iPad: iPad Pro M1, 12.9": iPadOS 17.4.1, Apple Pencil 2, Magic Keyboard Mac: 2023 M2 MacBook Air 15", 16GB memory, macOS Sonoma 14.4.1 Link to comment Share on other sites More sharing options...
DM1 Posted September 26, 2018 Share Posted September 26, 2018 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. Quote M1 IPad Air 10.9/256GB lpadOS 17.1.1 Apple Pencil (2nd gen). Affinity Photo 1.10.5 Affinity Design 1.10.5 Affinity Publisher 2, Affinity Designer 2, Affinity Photo 2 and betas. Official Online iPad Help documents (multi-lingual) here: https://affinity.https://affinity.help/ Link to comment Share on other sites More sharing options...
Kennethchase Posted September 26, 2018 Author Share Posted September 26, 2018 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 Quote Link to comment Share on other sites More sharing options...
walt.farrell Posted September 27, 2018 Share Posted September 27, 2018 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. Quote -- Walt Designer, Photo, and Publisher V1 and V2 at latest retail and beta releases PC: Desktop: Windows 11 Pro, version 23H2, 64GB memory, AMD Ryzen 9 5900 12-Core @ 3.00 GHz, NVIDIA GeForce RTX 3090 Laptop: Windows 11 Pro, version 23H2, 32GB memory, Intel Core i7-10750H @ 2.60GHz, Intel UHD Graphics Comet Lake GT2 and NVIDIA GeForce RTX 3070 Laptop GPU. iPad: iPad Pro M1, 12.9": iPadOS 17.4.1, Apple Pencil 2, Magic Keyboard Mac: 2023 M2 MacBook Air 15", 16GB memory, macOS Sonoma 14.4.1 Link to comment Share on other sites More sharing options...
Kennethchase Posted September 27, 2018 Author Share Posted September 27, 2018 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 Quote Link to comment Share on other sites More sharing options...
Kennethchase Posted September 27, 2018 Author Share Posted September 27, 2018 Thanks again Walt. Would you please advise me how to make the change you suggest. I don’t recall ever seeing rgb/8. I have saved files in rug but not seen options. best, ken Quote Link to comment Share on other sites More sharing options...
walt.farrell Posted September 27, 2018 Share Posted September 27, 2018 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): You can also see your color format via Document > Color Format. Here's one where the document is RGB/8: Question: what color format is your document? Quote -- Walt Designer, Photo, and Publisher V1 and V2 at latest retail and beta releases PC: Desktop: Windows 11 Pro, version 23H2, 64GB memory, AMD Ryzen 9 5900 12-Core @ 3.00 GHz, NVIDIA GeForce RTX 3090 Laptop: Windows 11 Pro, version 23H2, 32GB memory, Intel Core i7-10750H @ 2.60GHz, Intel UHD Graphics Comet Lake GT2 and NVIDIA GeForce RTX 3070 Laptop GPU. iPad: iPad Pro M1, 12.9": iPadOS 17.4.1, Apple Pencil 2, Magic Keyboard Mac: 2023 M2 MacBook Air 15", 16GB memory, macOS Sonoma 14.4.1 Link to comment Share on other sites More sharing options...
Kennethchase Posted September 27, 2018 Author Share Posted September 27, 2018 This is what I see when I open documents. Nothing like the interface you posted. When I chose the hand icon nothing happened. Quote Link to comment Share on other sites More sharing options...
walt.farrell Posted September 27, 2018 Share Posted September 27, 2018 Someone who knows/uses the iPad version will have to tell you how to find the information; sorry. Quote -- Walt Designer, Photo, and Publisher V1 and V2 at latest retail and beta releases PC: Desktop: Windows 11 Pro, version 23H2, 64GB memory, AMD Ryzen 9 5900 12-Core @ 3.00 GHz, NVIDIA GeForce RTX 3090 Laptop: Windows 11 Pro, version 23H2, 32GB memory, Intel Core i7-10750H @ 2.60GHz, Intel UHD Graphics Comet Lake GT2 and NVIDIA GeForce RTX 3070 Laptop GPU. iPad: iPad Pro M1, 12.9": iPadOS 17.4.1, Apple Pencil 2, Magic Keyboard Mac: 2023 M2 MacBook Air 15", 16GB memory, macOS Sonoma 14.4.1 Link to comment Share on other sites More sharing options...
Kennethchase Posted September 27, 2018 Author Share Posted September 27, 2018 Thanks Walt. Appreciate your effort. Quote Link to comment Share on other sites More sharing options...
DM1 Posted September 27, 2018 Share Posted September 27, 2018 You need to use the Convert Document menu to change colour space. walt.farrell 1 Quote M1 IPad Air 10.9/256GB lpadOS 17.1.1 Apple Pencil (2nd gen). Affinity Photo 1.10.5 Affinity Design 1.10.5 Affinity Publisher 2, Affinity Designer 2, Affinity Photo 2 and betas. Official Online iPad Help documents (multi-lingual) here: https://affinity.https://affinity.help/ Link to comment Share on other sites More sharing options...
Kennethchase Posted September 28, 2018 Author Share Posted September 28, 2018 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. Quote Link to comment Share on other sites More sharing options...
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.
Note: Your post will require moderator approval before it will be visible.