Today, 01:21 AM
Hi,
Sorry in advance for the length of this post. TLDR version is that exporting an image from GIMP to TIFF format yields weird results.
All of the work described below is taking place on a Dell laptop with Intel x64 processor running 64-bit Windows 10, darktable 5.2.0, and GIMP 3.2.4. My overall goal is to create a composite TIFF image comprising four cropped photos side by side, and then make a print.
I have four cropped photos that were post-edited from camera raw using darktable and exported to TIFF files using darktable settings shown in the attachment darktable_export_settings.jpg. I checked the darktable exports using Windows photo viewer, and they all looked fine.
I next imported the four photos into GIMP, converting the color profile to the built-in GIMP sRGB. I created an appropriately sized empty image and pasted the photos into it, each on a separate layer, and set the X offsets to arrange the photos. Lastly, I put a white background layer on the bottom to show white separator regions. All layers were set to 100% opacity. The attachment GIMP_preview_scrape.jpg shows the contents of the workspace image preview after all of the editing. The preview looks exactly as I intended.
I then exported from GIMP to a new TIFF file using File->Export As... with the settings shown in attachment GIMP_export_settings.jpg. I think the important thing to note is that I exported uncompressed and did not save layers. This is where the problem shows up. I opened the new TIFF file with Windows photo viewer, and it was extremely grainy (see attachment GIMP_export_preview.jpg).
I tried repeating the entire process but exporting from GIMP to JPG, and the final image was flawless. Obviously I could resort to using JPG instead of TIFF to make my print, but I really want to understand where I went wrong in this process.
Any suggestions?
Thanks,
Mike
Sorry in advance for the length of this post. TLDR version is that exporting an image from GIMP to TIFF format yields weird results.
All of the work described below is taking place on a Dell laptop with Intel x64 processor running 64-bit Windows 10, darktable 5.2.0, and GIMP 3.2.4. My overall goal is to create a composite TIFF image comprising four cropped photos side by side, and then make a print.
I have four cropped photos that were post-edited from camera raw using darktable and exported to TIFF files using darktable settings shown in the attachment darktable_export_settings.jpg. I checked the darktable exports using Windows photo viewer, and they all looked fine.
I next imported the four photos into GIMP, converting the color profile to the built-in GIMP sRGB. I created an appropriately sized empty image and pasted the photos into it, each on a separate layer, and set the X offsets to arrange the photos. Lastly, I put a white background layer on the bottom to show white separator regions. All layers were set to 100% opacity. The attachment GIMP_preview_scrape.jpg shows the contents of the workspace image preview after all of the editing. The preview looks exactly as I intended.
I then exported from GIMP to a new TIFF file using File->Export As... with the settings shown in attachment GIMP_export_settings.jpg. I think the important thing to note is that I exported uncompressed and did not save layers. This is where the problem shows up. I opened the new TIFF file with Windows photo viewer, and it was extremely grainy (see attachment GIMP_export_preview.jpg).
I tried repeating the entire process but exporting from GIMP to JPG, and the final image was flawless. Obviously I could resort to using JPG instead of TIFF to make my print, but I really want to understand where I went wrong in this process.
Any suggestions?
Thanks,
Mike