# ImageBlob regression in 27.9.1 and 27.10.0: all documented pixel formats misdecode; RGBA read in wrong byte order **URL:** \ **Category:** UXP Plugin API\ **Tags:** bug\ **Created:** [September 6, 2026, 2:07pm UTC](https://forums.creativeclouddeveloper.com/t/imageblob-regression-in-27-9-1-and-27-10-0-all-documented-pixel-formats-misdecode-rgba-read-in-wrong-byte-order/12150 "2026-09-06T14:07:07Z")\ **Posts on this page:** 8\ **Page:** 1
**Author:** ![Kayrock](https://sea1.discourse-cdn.com/flex015/user_avatar/forums.creativeclouddeveloper.com/kayrock/32/4748_2.png) [@Kayrock](https://forums.creativeclouddeveloper.com/u/Kayrock)\ **Post date:** [September 6, 2026, 2:07pm UTC](https://forums.creativeclouddeveloper.com/t/imageblob-regression-in-27-9-1-and-27-10-0-all-documented-pixel-formats-misdecode-rgba-read-in-wrong-byte-order/12150/1 "2026-09-06T14:07:07Z")
![image_blob_screenshot](https://us1.discourse-cdn.com/flex015/uploads/xdplugins/original/2X/c/c5f63094dc39b14f25601d0f6bb3a1392bf94726.jpeg) Since 27.9.1, `ImageBlob` → `createObjectURL` → `` misdecodes every documented format. Verified with the attached minimal repro plugin: **correct on 26.11.2, broken on 27.9.1 and 27.10.0** , same machine (screenshots attached). - **Gray (1), GrayscaleAlpha (2), RGB (3):** silently scrambled, no exception thrown. The decoder appears to read at a 4-byte stride, so it also reads **past the end of the buffer** and renders stale process memory (output changes on every redraw). The docs’ own example, a 3-component buffer of `[255,0,0]` triplets, does not render red. - **RGBA (4):** channels rotated The repro is self-contained (no build step, load via UDT), renders one known pattern through each format on both panel and modal-dialog surfaces, and prints expected results per row. Timing lines up with the new UI backend rollout, ImageBlob hands raw buffers to exactly that layer. [uxp-imageblob-repro.zip](https://forums.creativeclouddeveloper.com/uploads/short-url/pCmdXtsLlkxsS3fW30VBQHDpx1l.zip) (206.6 KB) ---
**Author:** ![haller](https://avatars.discourse-cdn.com/v4/letter/h/53a042/32.png) [@haller](https://forums.creativeclouddeveloper.com/u/haller)\ **Post date:** [September 7, 2026, 10:08am UTC](https://forums.creativeclouddeveloper.com/t/imageblob-regression-in-27-9-1-and-27-10-0-all-documented-pixel-formats-misdecode-rgba-read-in-wrong-byte-order/12150/2 "2026-09-07T10:08:09Z")
Yes, this is a known issue and has already been reported. ---
**Author:** ![Kayrock](https://sea1.discourse-cdn.com/flex015/user_avatar/forums.creativeclouddeveloper.com/kayrock/32/4748_2.png) [@Kayrock](https://forums.creativeclouddeveloper.com/u/Kayrock)\ **Post date:** [September 8, 2026, 5:57pm UTC](https://forums.creativeclouddeveloper.com/t/imageblob-regression-in-27-9-1-and-27-10-0-all-documented-pixel-formats-misdecode-rgba-read-in-wrong-byte-order/12150/3 "2026-09-08T17:57:39Z")
Thanks Haller. I was the one who posted it in the Drover thread 24 days ago, but I never got a response. Is that where did you saw it before? Do you know the Jira ticket number or what build the fix is targeted for? ---
**Author:** ![haller](https://avatars.discourse-cdn.com/v4/letter/h/53a042/32.png) [@haller](https://forums.creativeclouddeveloper.com/u/haller)\ **Post date:** [September 9, 2026, 5:39am UTC](https://forums.creativeclouddeveloper.com/t/imageblob-regression-in-27-9-1-and-27-10-0-all-documented-pixel-formats-misdecode-rgba-read-in-wrong-byte-order/12150/4 "2026-09-09T05:39:55Z")
No, I haven’t seen it, but I know they’re already working on fixing the problem, maybe it’s already ready for the next update. ---
**Author:** ![Kayrock](https://sea1.discourse-cdn.com/flex015/user_avatar/forums.creativeclouddeveloper.com/kayrock/32/4748_2.png) [@Kayrock](https://forums.creativeclouddeveloper.com/u/Kayrock)\ **Post date:** [September 9, 2026, 9:05am UTC](https://forums.creativeclouddeveloper.com/t/imageblob-regression-in-27-9-1-and-27-10-0-all-documented-pixel-formats-misdecode-rgba-read-in-wrong-byte-order/12150/5 "2026-09-09T09:05:21Z")
Thanks, I am curious how you know that it is a known issue that they are working on? It is posted anywhere online? ---
**Author:** ![Kayrock](https://sea1.discourse-cdn.com/flex015/user_avatar/forums.creativeclouddeveloper.com/kayrock/32/4748_2.png) [@Kayrock](https://forums.creativeclouddeveloper.com/u/Kayrock)\ **Post date:** [September 10, 2026, 10:02am UTC](https://forums.creativeclouddeveloper.com/t/imageblob-regression-in-27-9-1-and-27-10-0-all-documented-pixel-formats-misdecode-rgba-read-in-wrong-byte-order/12150/6 "2026-09-10T10:02:53Z")
Just checked 27.11.0 and it is still broken. ---
**Author:** ![Kayrock](https://sea1.discourse-cdn.com/flex015/user_avatar/forums.creativeclouddeveloper.com/kayrock/32/4748_2.png) [@Kayrock](https://forums.creativeclouddeveloper.com/u/Kayrock)\ **Post date:** [September 14, 2026, 1:12pm UTC](https://forums.creativeclouddeveloper.com/t/imageblob-regression-in-27-9-1-and-27-10-0-all-documented-pixel-formats-misdecode-rgba-read-in-wrong-byte-order/12150/7 "2026-09-14T13:12:25Z")
@Erin_Finnegan @samgannaway Short version: in the shipping release, ImageBlob decodes none of its documented pixel formats correctly. The only byte order that renders correctly is one the docs do not describe: alpha first, A,R,G,B, with the meta still saying RGBA. 26.11.2 correct 27.9.1 broken 27.10.0 broken 27.11.0 broken (checked Sept 10) The repro is attached to the first post: no build step, loads in UDT, renders one known pattern through every documented format and prints the expected result per row. Gray, GrayscaleAlpha and RGB come out scrambled with no exception thrown. The docs’ own example, a 3-component buffer of [255,0,0] triplets, does not render red. I reported this in the UXP UI backend thread (11910, post 53) on Aug 15, which is why I think it is Drover. We do ship around it, so this is not a request to hurry. What I need is the build number where the decoder is fixed. The workaround is a version test with no upper bound, so on the day the fix ships every installed copy starts rendering rotated again with no change from us, and turning it off early breaks the older builds. A heads up in this thread with the target build is worth more to me than the fix date. Sorry for the direct tag. This has had no reply in a month and it is in the release build. ---
**Author:** ![Kayrock](https://sea1.discourse-cdn.com/flex015/user_avatar/forums.creativeclouddeveloper.com/kayrock/32/4748_2.png) [@Kayrock](https://forums.creativeclouddeveloper.com/u/Kayrock)\ **Post date:** [September 14, 2026, 7:38pm UTC](https://forums.creativeclouddeveloper.com/t/imageblob-regression-in-27-9-1-and-27-10-0-all-documented-pixel-formats-misdecode-rgba-read-in-wrong-byte-order/12150/8 "2026-09-14T19:38:34Z")
Update: on Windows this is total failure, not a misdecode. Same repro as the first post. On Windows 27.9.1 and 27.10.0 no documented format renders at all: the blob and its object URL are created without error, then onload never fires, onerror never fires, naturalWidth stays 0, and Photoshop reports “Uncaught class droverbindings::droverbindings\_error while executing UXP TaskQueue item”. No byte order or component count avoids it, and it is identical with Use Graphics Processor off. The same pattern as a PNG through the same renders perfectly on that machine and build, so Blob, object URLs and decoding are all fine. It is ImageBlob’s uncompressed path.