get type from the text of image
Hi Has anyone got a handler that works out the image type from the text of the image. I want to save the text of an image but I want to do so with the correct extension. I don't want to use the export command because of the risk of some quality loss from the image. This is for the VCS stuff I'm working on so it would need to have some open source license. Cheers Monte -- Monte Goulding M E R Goulding - software development services mergExt - There's an external for that! ___ use-livecode mailing list use-livecode@lists.runrev.com Please visit this url to subscribe, unsubscribe and manage your subscription preferences: http://lists.runrev.com/mailman/listinfo/use-livecode
Re: get type from the text of image
OK.. came up with the following based on a StackOverflow answer on doing this in C. Anyone have anything better?: function imageDataExtension pData if char 1 to 4 of pData is GIF8 then return gif else if byteToNum(char 1 of pData) is 255 and byteToNum(char 2 of pData) is 216 then return jpg else if byteToNum(char 1 of pData) is 137 and byteToNum(char 2 of pData) is 80 and \ byteToNum(char 1 of pData) is 78 and byteToNum(char 2 of pData) is 71 then return png else if byteToNum(char 1 of pData) is 46 and byteToNum(char 2 of pData) is 77 then return bmp else return image end if end imageDataExtension On 23/02/2013, at 7:40 AM, Monte Goulding mo...@sweattechnologies.com wrote: Hi Has anyone got a handler that works out the image type from the text of the image. I want to save the text of an image but I want to do so with the correct extension. I don't want to use the export command because of the risk of some quality loss from the image. This is for the VCS stuff I'm working on so it would need to have some open source license. Cheers Monte -- Monte Goulding M E R Goulding - software development services mergExt - There's an external for that! ___ use-livecode mailing list use-livecode@lists.runrev.com Please visit this url to subscribe, unsubscribe and manage your subscription preferences: http://lists.runrev.com/mailman/listinfo/use-livecode -- Monte Goulding M E R Goulding - software development services mergExt - There's an external for that! ___ use-livecode mailing list use-livecode@lists.runrev.com Please visit this url to subscribe, unsubscribe and manage your subscription preferences: http://lists.runrev.com/mailman/listinfo/use-livecode
Re: get type from the text of image
Hi Monte: You can probably use the paintCompression property to check the image type. It might also help to know that PNG is essentially lossless -- you shouldn't lose any image data using this format. You may find that dealing with the gamma of PNG images is something of a black art and can cause subtle changes in how an image is displayed. But this is true for the many apps that save/display PNGs, as well as LC, so it may not be an issue. Regards, Scott Rossi Creative Director Tactile Media, UX Design On 2/22/13 12:40 PM, Monte Goulding mo...@sweattechnologies.com wrote: Hi Has anyone got a handler that works out the image type from the text of the image. I want to save the text of an image but I want to do so with the correct extension. I don't want to use the export command because of the risk of some quality loss from the image. This is for the VCS stuff I'm working on so it would need to have some open source license. Cheers Monte -- Monte Goulding M E R Goulding - software development services mergExt - There's an external for that! ___ use-livecode mailing list use-livecode@lists.runrev.com Please visit this url to subscribe, unsubscribe and manage your subscription preferences: http://lists.runrev.com/mailman/listinfo/use-livecode ___ use-livecode mailing list use-livecode@lists.runrev.com Please visit this url to subscribe, unsubscribe and manage your subscription preferences: http://lists.runrev.com/mailman/listinfo/use-livecode
Re: get type from the text of image
Ah... the paintCompression might be sufficient to use as an extension. It's not perfect but it will probably do. Basically if someone imported a JPG I didn't think it would be suitable for the VCS to export/import as png. If you say it would be ok then I'll run with that. What I'm doing is each object will be represented by a folder and while most properties will be exported as JSON I thought there are some properties that would be better as separate files. The script is the prime example but an image is another one. Also I'm considering the htmlText of a field may be worthwhile as a separate property although that could get quite complicated for unshared text in shared groups so might be best avoided. On 23/02/2013, at 8:22 AM, Scott Rossi sc...@tactilemedia.com wrote: You can probably use the paintCompression property to check the image type. It might also help to know that PNG is essentially lossless -- you shouldn't lose any image data using this format. You may find that dealing with the gamma of PNG images is something of a black art and can cause subtle changes in how an image is displayed. But this is true for the many apps that save/display PNGs, as well as LC, so it may not be an issue. -- Monte Goulding M E R Goulding - software development services mergExt - There's an external for that! ___ use-livecode mailing list use-livecode@lists.runrev.com Please visit this url to subscribe, unsubscribe and manage your subscription preferences: http://lists.runrev.com/mailman/listinfo/use-livecode
Re: get type from the text of image
It turns out the paintCompression is yet another property not in the properties array (YAPNITPA)... On 23/02/2013, at 8:37 AM, Monte Goulding mo...@sweattechnologies.com wrote: Ah... the paintCompression might be sufficient to use as an extension. It's not perfect but it will probably do. Basically if someone imported a JPG I didn't think it would be suitable for the VCS to export/import as png. If you say it would be ok then I'll run with that. What I'm doing is each object will be represented by a folder and while most properties will be exported as JSON I thought there are some properties that would be better as separate files. The script is the prime example but an image is another one. Also I'm considering the htmlText of a field may be worthwhile as a separate property although that could get quite complicated for unshared text in shared groups so might be best avoided. On 23/02/2013, at 8:22 AM, Scott Rossi sc...@tactilemedia.com wrote: You can probably use the paintCompression property to check the image type. It might also help to know that PNG is essentially lossless -- you shouldn't lose any image data using this format. You may find that dealing with the gamma of PNG images is something of a black art and can cause subtle changes in how an image is displayed. But this is true for the many apps that save/display PNGs, as well as LC, so it may not be an issue. -- Monte Goulding M E R Goulding - software development services mergExt - There's an external for that! ___ use-livecode mailing list use-livecode@lists.runrev.com Please visit this url to subscribe, unsubscribe and manage your subscription preferences: http://lists.runrev.com/mailman/listinfo/use-livecode -- Monte Goulding M E R Goulding - software development services mergExt - There's an external for that! ___ use-livecode mailing list use-livecode@lists.runrev.com Please visit this url to subscribe, unsubscribe and manage your subscription preferences: http://lists.runrev.com/mailman/listinfo/use-livecode
Re: get type from the text of image
Not sure about your setup, but I imagine you could store binary image data so you don't have to mess with image format all. The one complication is if you allow folks to scale an image in whatever you're doing. You'll need to save the reformatted image data, so recompressing JPEG shouldn't be an issue as long as you start with best resizeQuality. Regards, Scott Rossi Creative Director Tactile Media, UX Design On 2/22/13 1:37 PM, Monte Goulding mo...@sweattechnologies.com wrote: Ah... the paintCompression might be sufficient to use as an extension. It's not perfect but it will probably do. Basically if someone imported a JPG I didn't think it would be suitable for the VCS to export/import as png. If you say it would be ok then I'll run with that. What I'm doing is each object will be represented by a folder and while most properties will be exported as JSON I thought there are some properties that would be better as separate files. The script is the prime example but an image is another one. Also I'm considering the htmlText of a field may be worthwhile as a separate property although that could get quite complicated for unshared text in shared groups so might be best avoided. On 23/02/2013, at 8:22 AM, Scott Rossi sc...@tactilemedia.com wrote: You can probably use the paintCompression property to check the image type. It might also help to know that PNG is essentially lossless -- you shouldn't lose any image data using this format. You may find that dealing with the gamma of PNG images is something of a black art and can cause subtle changes in how an image is displayed. But this is true for the many apps that save/display PNGs, as well as LC, so it may not be an issue. -- Monte Goulding M E R Goulding - software development services mergExt - There's an external for that! ___ use-livecode mailing list use-livecode@lists.runrev.com Please visit this url to subscribe, unsubscribe and manage your subscription preferences: http://lists.runrev.com/mailman/listinfo/use-livecode ___ use-livecode mailing list use-livecode@lists.runrev.com Please visit this url to subscribe, unsubscribe and manage your subscription preferences: http://lists.runrev.com/mailman/listinfo/use-livecode
Re: get type from the text of image
On 23/02/2013, at 9:08 AM, Scott Rossi sc...@tactilemedia.com wrote: Not sure about your setup, but I imagine you could store binary image data so you don't have to mess with image format all. The one complication is if you allow folks to scale an image in whatever you're doing. You'll need to save the reformatted image data, so recompressing JPEG shouldn't be an issue as long as you start with best resizeQuality. This is for a stackFile export/import script for VCS support. I was exporting imageData ad alphaData but then I realised that the text of the image covers both so why not just use that. All the other properties are stored too so it's up to the user to set the resizeQuality which as it turns out is YANPNITPA !!! -- Monte Goulding M E R Goulding - software development services mergExt - There's an external for that! ___ use-livecode mailing list use-livecode@lists.runrev.com Please visit this url to subscribe, unsubscribe and manage your subscription preferences: http://lists.runrev.com/mailman/listinfo/use-livecode
Re: get type from the text of image
On 2013-02-22, at 2:05 PM, Monte Goulding wrote: It turns out the paintCompression is yet another property not in the properties array (YAPNITPA)... Monte, If you are using the properties of an object stored in an array for rebuilding a stack in your VCS, you probably should be aware of the bug I found recently, it affects re-storing the patterns of a control when re-storing all of the properties from an array. More info; http://quality.runrev.com/show_bug.cgi?id=10683 Mark assures me the issue is fixed for the next release, but it may throw a spanner in the works if you come across the same issue for your tests with the current LC builds, i.e. 5.5.4 or 6.0.0-dp4 so I just thought I'd mention it in case this saves you some hassle. Paul ___ use-livecode mailing list use-livecode@lists.runrev.com Please visit this url to subscribe, unsubscribe and manage your subscription preferences: http://lists.runrev.com/mailman/listinfo/use-livecode
Re: get type from the text of image
Thanks Paul For readability of the properties file I have moved the colors and patterns to their named individual counterparts rather than the list you get in the properties array. Otherwise in a text diff it's unclear exactly which property changed. So I don't think my code will have this issue but thanks for the heads up. Cheers Monte On 23/02/2013, at 11:18 AM, Paul Hibbert l...@pbh.on-rev.com wrote: If you are using the properties of an object stored in an array for rebuilding a stack in your VCS, you probably should be aware of the bug I found recently, it affects re-storing the patterns of a control when re-storing all of the properties from an array. More info; http://quality.runrev.com/show_bug.cgi?id=10683 Mark assures me the issue is fixed for the next release, but it may throw a spanner in the works if you come across the same issue for your tests with the current LC builds, i.e. 5.5.4 or 6.0.0-dp4 so I just thought I'd mention it in case this saves you some hassle. -- Monte Goulding M E R Goulding - software development services mergExt - There's an external for that! ___ use-livecode mailing list use-livecode@lists.runrev.com Please visit this url to subscribe, unsubscribe and manage your subscription preferences: http://lists.runrev.com/mailman/listinfo/use-livecode
