https://bugs.kde.org/show_bug.cgi?id=364790
--- Comment #3 from DrSlony <b...@londonlight.org> --- "Yes, the 100% always refer to the original size of the image." This is a bad design choice, and I will explain why. When stretching the embedded JPEG preview to the reported raw size, digiKam's preview is always blurry, soft and blocky when viewing raw files if one has a camera which does not embed a full-sized JPEG preview in the raw file. In fact, as most cameras which embed a "full-sized" JPEG preview don't actually make that JPEG the same size as the reported original raw size, we are left with a situation where digiKam's preview is never 1:1, never sharp, always stretched a little or a lot... Examples: Nikon D700, reported original size 4288x2844, largest embedded JPEG size 4256x2832 Nikon D70s, reported original size 3040x2014, largest embedded JPEG size 3008x2000 Nikon D80, reported original size 3904x2616, largest embedded JPEG size 3872x2592 Pentax K10D, reported original size 3936x2624, largest embedded JPEG size 3872x2592 Pentax K-3, reported original size 6080x4032, largest embedded JPEG size 6016x4000 Canon 7D, reported original size 5360x3516, largest embedded JPEG size 5184x3456 etc. If someone's camera makes the largest preview similar in size to the reported original size, digiKam's preview is only a little stretched, only a little blurry and blocky. If someone's camera makes the largest preview half the size of the reported original size, digiKam's preview is blurry and blocky beyond use. If one's raw files contain a preview which is half the size of the reported original raw size, if one sets digiKam as follows: "Preview Options > Embedded view shows full image > Embedded preview", one expects 100% to show a sharp embedded JPEG preview at 1:1 size, not this blurry mess https://i.imgur.com/xfg9W09.png At 100% I expect to see this https://i.imgur.com/1P8hEPN.jpg not this https://i.imgur.com/cSHPxEL.jpg >From the first I can tell the photo is perfectly in focus. From the second I can tell nothing. This stretching functionality is not helpful. How is one supposed to choose the sharpest of three shots in digiKam? How is one suppose to choose the shot most exposed to the right without clipping when digiKam insists on not allowing me to see the neutral raw data in the preview? How am I supposed to compare exposure-bracketed shots in digiKam if digiKam insists on applying auto-levels? The preview digiKam shows is essentially broken with an inability to zoom to 1:1 pixel level, and it is impossible to set digiKam to show a full-sized demosaiced no-auto-levels preview as I reported years ago. "Embedded view shows full image" is not true, it is misleading. I wrote how to fix that here https://bugs.kde.org/show_bug.cgi?id=319241#c9 I don't understand why someone would want a stretched, blurry, non-1:1 preview, but if there is such a need, fine. Then I propose this solution: Preview Options The preview image for raw files shows: ● The largest embedded JPEG image. ○ Full-sized demosaiced raw data. ○ Half-sized demosaiced raw data. Apply auto-levels to demosaiced raw data: (see bug #347010) ● No ○ Yes Stretch the embedded JPEG preview to raw image size? ● No ○ Yes -- You are receiving this mail because: You are watching all bug changes.
