when i add a tiff without srs,the tiff has become blurred

[csuxing]

this is my code:
osgEarth::Drivers::FileSystemCacheOptions filecapoptions;
filecapoptions.rootPath() = "D:\OEcache";
osgEarth::Map::Options configue;
configue.cache() = filecapoptions;
configue.cachePolicy() = osgEarth::CachePolicy::USAGE_READ_WRITE;

osg::ref_ptr<osg::Group> root = new osg::Group;
osg::ref_ptr<Map> map = new Map(configue, nullptr);

osgEarth::ProfileOptions profileOpts;
profileOpts.srsString() = "PROJCS["Beijing 1954 / 3-degree Gauss-Kruger CM 111E",GEOGCS["Beijing 1954",DATUM["Beijing_1954",SPHEROID["Krassowsky 1940",6378245,298.3,AUTHORITY["EPSG","7024"]],TOWGS84[15.8,-154.4,-82.3,0,0,0,0],AUTHORITY["EPSG","6214"]],PRIMEM["Greenwich",0,AUTHORITY["EPSG","8901"]],UNIT["degree",0.0174532925199433,AUTHORITY["EPSG","9122"]],AUTHORITY["EPSG","4214"]],PROJECTION["Transverse_Mercator"],PARAMETER["latitude_of_origin",0],PARAMETER["central_meridian",111],PARAMETER["scale_factor",1],PARAMETER["false_easting",500000],PARAMETER["false_northing",0],UNIT["metre",1,AUTHORITY["EPSG","9001"]],AUTHORITY["EPSG","2434"]]";//
profileOpts.bounds() = osgEarth::Bounds(ex.minx, ex.miny, ex.maxx, ex.maxy);//the tiff's bounds
map->setProfile(Profile::create(profileOpts));

osg::ref_ptr<osgEarth::MapNode> mapNode = new MapNode(map.get());

{
	GDALImageLayer* localImageMap = new GDALImageLayer();
	localImageMap->setURL(sdipath);
	map->addLayer(localImageMap);
}

[gwaldron]

It is hard to answer this question without knowing what you see and what you expect to see.

[csuxing]

Thanks for replying to my post.
This is I can see:

This is I want to see:

It looks like the resolution of the picture has been reduced.

[csuxing]

the left is I want to see，the right is I can see

[csuxing]

(1) I have an image file with plane projection information,which is 'PROJCS["Beijing 1954 / 3-degree Gauss-Kruger CM 111E",GEOGCS["Beijing 1954",DATUM["Beijing_1954",SPHEROID["Krassowsky 1940",6378245,298.3,AUTHORITY["EPSG","7024"]],TOWGS84[15.8,-154.4,-82.3,0,0,0,0],AUTHORITY["EPSG","6214"]],PRIMEM["Greenwich",0,AUTHORITY["EPSG","8901"]],UNIT["degree",0.0174532925199433,AUTHORITY["EPSG","9122"]],AUTHORITY["EPSG","4214"]],PROJECTION["Transverse_Mercator"],PARAMETER["latitude_of_origin",0],PARAMETER["central_meridian",111],PARAMETER["scale_factor",1],PARAMETER["false_easting",500000],PARAMETER["false_northing",0],UNIT["metre",1,AUTHORITY["EPSG","9001"]],AUTHORITY["EPSG","2434"]]'.
(2) I set its srs info and border extension info：
osgEarth::ProfileOptions profileOpts;
profileOpts.srsString() = "PROJCS["Beijing 1954 / 3-degree Gauss-Kruger CM 111E",GEOGCS["Beijing 1954",DATUM["Beijing_1954",SPHEROID["Krassowsky 1940",6378245,298.3,AUTHORITY["EPSG","7024"]],TOWGS84[15.8,-154.4,-82.3,0,0,0,0],AUTHORITY["EPSG","6214"]],PRIMEM["Greenwich",0,AUTHORITY["EPSG","8901"]],UNIT["degree",0.0174532925199433,AUTHORITY["EPSG","9122"]],AUTHORITY["EPSG","4214"]],PROJECTION["Transverse_Mercator"],PARAMETER["latitude_of_origin",0],PARAMETER["central_meridian",111],PARAMETER["scale_factor",1],PARAMETER["false_easting",500000],PARAMETER["false_northing",0],UNIT["metre",1,AUTHORITY["EPSG","9001"]],AUTHORITY["EPSG","2434"]]";//
profileOpts.bounds() = osgEarth::Bounds(ex.minx, ex.miny, ex.maxx, ex.maxy);//the tiff's bounds, The bounds range I got by reading the header information of the tiff file
map->setProfile(Profile::create(profileOpts));
(3) It can be displayed in osgearth, but the highest precision pagedLOD layer has a gap with the original image.
the left is I want to see,the right is I can see.

(4)Why can't I get the original image resolution?