It won't help you in the short term, but this conversation inspired me to make these changes:
https://github.com/OpenImageIO/oiio/pull/3853 <https://github.com/OpenImageIO/oiio/pull/3853> > On May 27, 2023, at 11:55 AM, Larry Gritz <l...@larrygritz.com> wrote: > > $ brew info openimageio > ==> openimageio: stable 2.4.11.1 (bottled), HEAD > Library for reading, processing and writing images > https://openimageio.org/ <https://openimageio.org/> > Not installed > From: > https://github.com/Homebrew/homebrew-core/blob/HEAD/Formula/openimageio.rb > <https://github.com/Homebrew/homebrew-core/blob/HEAD/Formula/openimageio.rb> > License: BSD-3-Clause > ==> Dependencies > Build: cmake ✘, pkg-config ✔ > Required: boost ✔, boost-python3 ✔, ffmpeg ✔, fmt ✘, freetype ✔, giflib ✔, > imath ✔, jpeg-turbo ✔, libheif ✔, libpng ✔, libraw ✔, libtiff ✔, opencolorio > ✔, openexr ✔, pugixml ✔, pybind11 ✔, python@3.11 ✔, webp ✔ > ==> Options > --HEAD > Install HEAD version > ==> Analytics > install: 2 (30 days), 23 (90 days), 7,666 (365 days) > install-on-request: 2 (30 days), 23 (90 days), 7,490 (365 days) > build-error: 0 (30 days) > > > The fact that opencv is not listed in Homebrew's list of dependencies makes > me think that probably Homebrew's build of OpenImageIO does not include > OpenCV support. You might need to build OpenImageIO itself in order to ensure > that it has OpenCV support built in. > > >> On May 27, 2023, at 11:22 AM, juneleungchan <juneleungc...@163.com >> <mailto:juneleungc...@163.com>> wrote: >> >> Hello, >> >> Thanks for your reply. >> >> I think the file can be loaded successfully cause I can write it to a local >> file after reading it. >> Thanks for your advice and I have changed the namespace to OIIO. >> >> My OIIO is downloaded with "brew install opencv”. >> I don't know if the oiio downloaded in this way has the header and lib of >> opencv. >> I'm on a Mac. >> >> I am writing a program and found that only OIIO can read and write EXR and >> DPX files perfectly, so I am now reading files from OIIO and then sending >> them to CVmat. >> >> Thanks. >> >> >> My Code updated: >> ``` >> #include <OpenImageIO/imagebuf.h> >> #include <OpenImageIO/imagebufalgo.h> >> #include <OpenImageIO/Imath.h> >> #include <OpenImageIO/imagecache.h> >> #include <OpenImageIO/imageio.h> >> using namespace OIIO; >> using namespace cv; >> >> // read >> QString img = "./0001.dpx"; >> ImageBuf buf(img.toStdString()); >> bool okR = buf.read (0, 0, true, TypeDesc::FLOAT); // true >> >> // write >> QString out = "./out.png"; >> bool okW = buf.write(out.toStdString().data()); // true >> >> // to CV >> auto Mat1 = cv::Mat {}; >> bool succ = ImageBufAlgo::to_OpenCV(Mat1, buf); >> >> // result >> qDebug()<< okR << okW << succ; // true true false >> ``` >> >> >> Juneleung >> TD >> juneleungc...@163.com >> >> <https://dashi.163.com/projects/signature-manager/detail/index.html?ftlId=3&name=Juneleung&uid=juneleungchan%40163.com&iconUrl=https%3A%2F%2Fmail-online.nosdn.127.net%2Fwzpmmc%2F3ef565873cb038cd2c89818903cf0fcc.jpg&email=Juneleungchan%40163.com&position=TD&items=%5B%22Juneleungchan%40163.com%22%5D> >> ---- Replied Message ---- >> From <oiio-dev-requ...@lists.openimageio.org> >> <mailto:oiio-dev-requ...@lists.openimageio.org> >> Date 05/28/2023 01:18 >> To <oiio-dev@lists.openimageio.org> <mailto:oiio-dev@lists.openimageio.org> >> Subject Oiio-dev Digest, Vol 176, Issue 18 >> Send Oiio-dev mailing list submissions to >> oiio-dev@lists.openimageio.org <mailto:oiio-dev@lists.openimageio.org> >> >> To subscribe or unsubscribe via the World Wide Web, visit >> http://lists.openimageio.org/listinfo.cgi/oiio-dev-openimageio.org >> <http://lists.openimageio.org/listinfo.cgi/oiio-dev-openimageio.org> >> or, via email, send a message with subject or body 'help' to >> oiio-dev-requ...@lists.openimageio.org >> <mailto:oiio-dev-requ...@lists.openimageio.org> >> >> You can reach the person managing the list at >> oiio-dev-ow...@lists.openimageio.org >> <mailto:oiio-dev-ow...@lists.openimageio.org> >> >> When replying, please edit your Subject line so it is more specific >> than "Re: Contents of Oiio-dev digest..." >> >> >> Today's Topics: >> >> 1. Connect with opencv (juneleungchan) >> 2. Re: Connect with opencv (Larry Gritz) >> >> >> ---------------------------------------------------------------------- >> >> Message: 1 >> Date: Sun, 28 May 2023 01:08:38 +0800 (GMT+08:00) >> From: juneleungchan <juneleungc...@163.com <mailto:juneleungc...@163.com>> >> To: "oiio-dev@lists.openimageio.org <mailto:oiio-dev@lists.openimageio.org>" >> <oiio-dev@lists.openimageio.org <mailto:oiio-dev@lists.openimageio.org>> >> Subject: [Oiio-dev] Connect with opencv >> Message-ID: <4c6b78bf.cb38.1885e2f0094.coremail.juneleungc...@163.com >> <mailto:4c6b78bf.cb38.1885e2f0094.coremail.juneleungc...@163.com>> >> Content-Type: text/plain; charset="utf-8" >> >> >> >> Hello, >> >> >> Thanks for your great work of OIIO. >> >> >> I have a question when using OIIO and wanna to ask how to use with details. >> I'm not sure if I'm writing to this email address is the right channel to >> ask questions. If not, please point me to it, thanks. >> >> >> >> >> My question is about how to convert between OIIO's buf and Opencv. I found >> related functions (ImageBufAlgo::to_OpenCV and ImageBufAlgo::from_OpenCV) in >> the manual, but it seems that I always get a false result for these the >> result of functions . >> >> >> I would like to ask if I am using it correctly, and is there any sample for >> reference? >> >> my code: >> ``` >> >> #include <OpenImageIO/imagebuf.h> >> #include <OpenImageIO/imagebufalgo.h> >> #include <OpenImageIO/Imath.h> >> #include <OpenImageIO/imagecache.h> >> #include <OpenImageIO/imageio.h> >> using namespace OpenImageIO_v2_4; >> using namespace cv; >> >> >> QString img = ?./0003.png"; >> ImageBuf buf(img.toStdString()); >> bool ok = buf.read (0, 0, true, TypeDesc::FLOAT); // true >> >> >> auto Mat1 = cv::Mat {}; >> bool succ = ImageBufAlgo::to_OpenCV(Mat1, buf); >> >> qDebug()<< succ ;// false >> >> >> ``` >> >> >> >> >> Functions I found: >> >> >> >> >> OpenCV interoperability is performed by the from_OpenCV() and to_OpenCV() >> functions: >> >> ImageBuf OIIO::ImageBufAlgo::from_OpenCV(const cv::Mat &mat, TypeDesc >> convert = TypeUnknown, ROI roi = {}, int nthreads = 0) >> >> >> Convert an OpenCV cv::Mat into an ImageBuf, copying the pixels (optionally >> converting to the pixel data type specified by convert, if not UNKNOWN, >> which means to preserve the original data type if possible). Return true if >> ok, false if it couldn?t figure out how to make the conversion from Mat to >> ImageBuf. If OpenImageIO was compiled without OpenCV support, this function >> will return an empty image with error message set. >> >> bool OIIO::ImageBufAlgo::to_OpenCV(cv::Mat &dst, const ImageBuf &src, ROI >> roi = {}, int nthreads = 0) >> >> >> Construct an OpenCV cv::Mat containing the contents of ImageBuf src, and >> return true. If it is not possible, or if OpenImageIO was compiled without >> OpenCV support, then return false. Note that OpenCV only supports up to 4 >> channels, so >4 channel images will be truncated in the conversion. >> >> >> >> Looking forward to your reply and thanks very much. >> >> >> Juneleung >> May 28 2023 >> >> >> | | >> Juneleung >> TD >> juneleungc...@163.com <mailto:juneleungc...@163.com> >> | >> >> -------------- next part -------------- >> An HTML attachment was scrubbed... >> URL: >> <http://lists.openimageio.org/pipermail/oiio-dev-openimageio.org/attachments/20230528/c59faa4e/attachment-0001.htm >> >> <http://lists.openimageio.org/pipermail/oiio-dev-openimageio.org/attachments/20230528/c59faa4e/attachment-0001.htm>> >> >> ------------------------------ >> >> Message: 2 >> Date: Sat, 27 May 2023 10:18:04 -0700 >> From: Larry Gritz <l...@larrygritz.com <mailto:l...@larrygritz.com>> >> To: OpenImageIO dev list <oiio-dev@lists.openimageio.org >> <mailto:oiio-dev@lists.openimageio.org>> >> Subject: Re: [Oiio-dev] Connect with opencv >> Message-ID: <87a326c6-7528-4661-bb85-c8fc42c55...@larrygritz.com >> <mailto:87a326c6-7528-4661-bb85-c8fc42c55...@larrygritz.com>> >> Content-Type: text/plain; charset="utf-8" >> >> I assume that the result of buf.read() is true, so you're sure the image was >> read in the first place? >> >> It's only a guess, but it's possible that OpenCV support was not enabled at >> build time for OpenImageIO. It needs to find the OpenCV headers and library >> when OpenImageIO itself is built, or else the to_OpenCV and from_OpenCV >> functions always just return false and don't try to do anything. >> >> I see now that there isn't an especially good way of knowing this from the >> built library. I will add something to make it easier to find out (without >> being the builder yourself) whether your copy of OIIO has OpenCV support >> enabled. >> >> As an unrelated aside, you should change >> >> using namespace OpenImageIO_v2_4; >> >> to >> >> using namespace OIIO; >> >> OIIO is always an alias for the fully versioned namespace. But then you >> don't need to update your source code for different versions of OpenImageIO. >> >> >> On May 27, 2023, at 10:08 AM, juneleungchan <juneleungc...@163.com >> <mailto:juneleungc...@163.com>> wrote: >> >> >> Hello, >> >> Thanks for your great work of OIIO. >> >> I have a question when using OIIO and wanna to ask how to use with details. >> I'm not sure if I'm writing to this email address is the right channel to >> ask questions. If not, please point me to it, thanks. >> >> >> My question is about how to convert between OIIO's buf and Opencv. I found >> related functions (ImageBufAlgo::to_OpenCV and ImageBufAlgo::from_OpenCV) in >> the manual, but it seems that I always get a false result for these the >> result of functions . >> >> I would like to ask if I am using it correctly, and is there any sample for >> reference? >> >> my code: >> ``` >> #include <OpenImageIO/imagebuf.h> >> #include <OpenImageIO/imagebufalgo.h> >> #include <OpenImageIO/Imath.h> >> #include <OpenImageIO/imagecache.h> >> #include <OpenImageIO/imageio.h> >> using namespace OpenImageIO_v2_4; >> using namespace cv; >> >> QString img = ?./0003.png"; >> ImageBuf buf(img.toStdString()); >> bool ok = buf.read (0, 0, true, TypeDesc::FLOAT); // true >> >> auto Mat1 = cv::Mat {}; >> bool succ = ImageBufAlgo::to_OpenCV(Mat1, buf); >> qDebug()<< succ ;// false >> >> ``` >> >> >> Functions I found: >> >> OpenCV interoperability is performed by the from_OpenCV() and to_OpenCV() >> functions: >> ImageBuf OIIO::ImageBufAlgo::from_OpenCV(const cv::Mat &mat, TypeDesc >> <https://openimageio.readthedocs.io/en/latest/imageioapi.html#_CPPv4N4OIIO8TypeDescE >> >> <https://openimageio.readthedocs.io/en/latest/imageioapi.html#_CPPv4N4OIIO8TypeDescE>> >> convert = TypeUnknown, ROI >> <https://openimageio.readthedocs.io/en/latest/imageioapi.html#_CPPv4N4OIIO3ROIE >> >> <https://openimageio.readthedocs.io/en/latest/imageioapi.html#_CPPv4N4OIIO3ROIE>> >> roi = {}, int nthreads = 0) >> Convert an OpenCV cv::Mat into an ImageBuf, copying the pixels (optionally >> converting to the pixel data type specified by convert, if not UNKNOWN, >> which means to preserve the original data type if possible). Return true if >> ok, false if it couldn?t figure out how to make the conversion from Mat to >> ImageBuf. If OpenImageIO was compiled without OpenCV support, this function >> will return an empty image with error message set. >> bool OIIO::ImageBufAlgo::to_OpenCV(cv::Mat &dst, const ImageBuf &src, ROI >> <https://openimageio.readthedocs.io/en/latest/imageioapi.html#_CPPv4N4OIIO3ROIE >> >> <https://openimageio.readthedocs.io/en/latest/imageioapi.html#_CPPv4N4OIIO3ROIE>> >> roi = {}, int nthreads = 0) >> Construct an OpenCV cv::Mat containing the contents of ImageBuf src, and >> return true. If it is not possible, or if OpenImageIO was compiled without >> OpenCV support, then return false. Note that OpenCV only supports up to 4 >> channels, so >4 channel images will be truncated in the conversion. >> >> Looking forward to your reply and thanks very much. >> >> Juneleung >> May 28 2023 >> >> >> Juneleung >> TD >> juneleungc...@163.com <mailto:juneleungc...@163.com> >> <https://dashi.163.com/projects/signature-manager/detail/index.html?ftlId=3&name=Juneleung&uid=juneleungchan%40163.com&iconUrl=https%3A%2F%2Fmail-online.nosdn.127.net%2Fwzpmmc%2F3ef565873cb038cd2c89818903cf0fcc.jpg&email=Juneleungchan%40163.com&position=TD&items=%5B%22Juneleungchan%40163.com%22%5D >> >> <https://dashi.163.com/projects/signature-manager/detail/index.html?ftlId=3&name=Juneleung&uid=juneleungchan%40163.com&iconUrl=https%3A%2F%2Fmail-online.nosdn.127.net%2Fwzpmmc%2F3ef565873cb038cd2c89818903cf0fcc.jpg&email=Juneleungchan%40163.com&position=TD&items=%5B%22Juneleungchan%40163.com%22%5D>> >> _______________________________________________ >> Oiio-dev mailing list >> Oiio-dev@lists.openimageio.org <mailto:Oiio-dev@lists.openimageio.org> >> <mailto:Oiio-dev@lists.openimageio.org >> <mailto:Oiio-dev@lists.openimageio.org>> >> http://lists.openimageio.org/listinfo.cgi/oiio-dev-openimageio.org >> <http://lists.openimageio.org/listinfo.cgi/oiio-dev-openimageio.org> >> <http://lists.openimageio.org/listinfo.cgi/oiio-dev-openimageio.org >> <http://lists.openimageio.org/listinfo.cgi/oiio-dev-openimageio.org>> >> -- >> Larry Gritz >> l...@larrygritz.com <mailto:l...@larrygritz.com> >> >> >> >> >> >> -------------- next part -------------- >> An HTML attachment was scrubbed... >> URL: >> <http://lists.openimageio.org/pipermail/oiio-dev-openimageio.org/attachments/20230527/3412d11a/attachment.htm >> >> <http://lists.openimageio.org/pipermail/oiio-dev-openimageio.org/attachments/20230527/3412d11a/attachment.htm>> >> >> ------------------------------ >> >> Subject: Digest Footer >> >> _______________________________________________ >> Oiio-dev mailing list >> Oiio-dev@lists.openimageio.org <mailto:Oiio-dev@lists.openimageio.org> >> http://lists.openimageio.org/listinfo.cgi/oiio-dev-openimageio.org >> <http://lists.openimageio.org/listinfo.cgi/oiio-dev-openimageio.org> >> >> >> ------------------------------ >> >> End of Oiio-dev Digest, Vol 176, Issue 18 >> ***************************************** >> _______________________________________________ >> Oiio-dev mailing list >> Oiio-dev@lists.openimageio.org <mailto:Oiio-dev@lists.openimageio.org> >> http://lists.openimageio.org/listinfo.cgi/oiio-dev-openimageio.org >> <http://lists.openimageio.org/listinfo.cgi/oiio-dev-openimageio.org> > -- > Larry Gritz > l...@larrygritz.com <mailto:l...@larrygritz.com> > > > > > > _______________________________________________ > Oiio-dev mailing list > Oiio-dev@lists.openimageio.org > http://lists.openimageio.org/listinfo.cgi/oiio-dev-openimageio.org -- Larry Gritz l...@larrygritz.com
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