When I try to open a resource pack that is 512x+, my game either resets to the default pack or shows one of the following crashes.
1:
---- Minecraft Crash Report ----
// Who set us up the TNT?

Time: 6/5/15 5:48 PM
Description: Updating screen events

java.lang.OutOfMemoryError: Java heap space
at bmi.a(SourceFile:363)
at bmi.a(SourceFile:263)
at bmh.b(SourceFile:130)
at bmh.a(SourceFile:77)
at bot.j(SourceFile:553)
at bot.a(SourceFile:139)
at bou.a(SourceFile:23)
at bnn.c(SourceFile:104)
at bnn.a(SourceFile:92)
at ave.e(SourceFile:652)
at azo.a(SourceFile:161)
at axu.a(SourceFile:350)
at azo.a(SourceFile:169)
at axu.k(SourceFile:413)
at azo.k(SourceFile:74)
at axu.p(SourceFile:390)
at ave.s(SourceFile:1497)
at ave.av(SourceFile:888)
at ave.a(SourceFile:325)
at net.minecraft.client.main.Main.main(SourceFile:124)

A detailed walkthrough of the error, its code path and all known details is as follows:
---------------------------------------------------------------------------------------

– Head –
Stacktrace:
at bmi.a(SourceFile:363)
at bmi.a(SourceFile:263)
at bmh.b(SourceFile:130)
at bmh.a(SourceFile:77)
at bot.j(SourceFile:553)
at bot.a(SourceFile:139)
at bou.a(SourceFile:23)
at bnn.c(SourceFile:104)
at bnn.a(SourceFile:92)
at ave.e(SourceFile:652)
at azo.a(SourceFile:161)
at axu.a(SourceFile:350)
at azo.a(SourceFile:169)
at axu.k(SourceFile:413)
at azo.k(SourceFile:74)
at axu.p(SourceFile:390)

– Affected screen –
Details:
Screen name: azo

– Affected level –
Details:
Level name: MpServer
All players: 1 total; [bew['IStanton'/240, l='MpServer', x=176.32, y=11.64, z=-1272.87]]
Chunk stats: MultiplayerChunkCache: 441, 441
Level seed: 0
Level generator: ID 01 - flat, ver 0. Features enabled: false
Level generator options:
Level spawn location: 206.00,5.00,-1239.00 - World: (206,5,-1239), Chunk: (at 14,0,9 in 12,-78; contains blocks 192,0,-1248 to 207,255,-1233), Region: (0,-3; contains chunks 0,-96 to 31,-65, blocks 0,0,-1536 to 511,255,-1025)
Level time: 562377 game time, 250987 day time
Level dimension: 0
Level storage version: 0x00000 - Unknown?
Level weather: Rain time: 0 (now: false), thunder time: 0 (now: false)
Level game mode: Game mode: creative (ID 1). Hardcore: false. Cheats: false
Forced entities: 79 total; [bew['IStanton'/240, l='MpServer', x=176.32, y=11.64, z=-1272.87], wa['Skeleton'/2216995, l='MpServer', x=241.16, y=22.00, z=-1316.38], wa['Skeleton'/2216994, l='MpServer', x=241.50, y=22.00, z=-1320.50], wa['Skeleton'/2216997, l='MpServer', x=238.50, y=22.00, z=-1317.50], wa['Skeleton'/2216996, l='MpServer', x=239.50, y=22.00, z=-1318.50], vn['Creeper'/2117678, l='MpServer', x=212.50, y=41.00, z=-1327.50], vn['Creeper'/2123056, l='MpServer', x=225.50, y=40.00, z=-1288.50], wc['Spider'/2190384, l='MpServer', x=218.56, y=59.00, z=-1275.69], vn['Creeper'/1931264, l='MpServer', x=171.38, y=39.00, z=-1288.03], we['Zombie'/2144063, l='MpServer', x=240.53, y=55.00, z=-1325.56], vn['Creeper'/2216963, l='MpServer', x=247.91, y=12.00, z=-1284.50], vn['Creeper'/2258692, l='MpServer', x=228.50, y=24.00, z=-1318.50], vn['Creeper'/2258693, l='MpServer', x=226.25, y=23.00, z=-1316.61], wd['Witch'/1863980, l='MpServer', x=211.50, y=58.00, z=-1340.50], we['Zombie'/2216983, l='MpServer', x=192.50, y=14.00, z=-1307.50], we['Zombie'/2216982, l='MpServer', x=188.50, y=14.00, z=-1306.50], we['Zombie'/2090021, l='MpServer', x=244.50, y=31.00, z=-1332.09], vn['Creeper'/1795419, l='MpServer', x=171.50, y=39.00, z=-1278.50], wa['Skeleton'/2263649, l='MpServer', x=232.50, y=56.00, z=-1318.50], we['Zombie'/2141296, l='MpServer', x=176.50, y=31.00, z=-1312.50], we['Zombie'/1088582, l='MpServer', x=173.59, y=35.00, z=-1272.09], vn['Creeper'/1940862, l='MpServer', x=169.06, y=28.00, z=-1296.38], we['Zombie'/1829246, l='MpServer', x=232.34, y=42.00, z=-1323.66], wd['Witch'/2242126, l='MpServer', x=251.50, y=37.00, z=-1323.50], we['Zombie'/918627, l='MpServer', x=176.59, y=31.00, z=-1295.13], we['Zombie'/2140752, l='MpServer', x=254.50, y=38.00, z=-1322.50], wa['Skeleton'/2061675, l='MpServer', x=249.50, y=58.00, z=-1297.50], wa['Skeleton'/2263638, l='MpServer', x=185.50, y=33.00, z=-1344.50], vn['Creeper'/2121308, l='MpServer', x=195.56, y=35.00, z=-1303.53], wc['Spider'/1895523, l='MpServer', x=220.53, y=59.00, z=-1274.38], wc['Spider'/2192293, l='MpServer', x=182.50, y=37.00, z=-1306.50], we['Zombie'/1946267, l='MpServer', x=191.50, y=40.00, z=-1305.50], we['Zombie'/2167463, l='MpServer', x=241.50, y=37.00, z=-1333.50], wa['Skeleton'/1987481, l='MpServer', x=215.50, y=38.00, z=-1313.50], we['Zombie'/2192294, l='MpServer', x=180.50, y=37.00, z=-1306.50], tt['Pig'/136, l='MpServer', x=160.47, y=67.00, z=-1341.72], tt['Pig'/137, l='MpServer', x=174.28, y=70.00, z=-1330.53], we['Zombie'/2167464, l='MpServer', x=242.50, y=37.00, z=-1332.50], tt['Pig'/138, l='MpServer', x=160.69, y=71.00, z=-1298.56], we['Zombie'/2138297, l='MpServer', x=245.50, y=46.00, z=-1294.97], vn['Creeper'/1946301, l='MpServer', x=178.59, y=31.00, z=-1280.91], tt['Pig'/164, l='MpServer', x=182.88, y=70.00, z=-1313.31], vn['Creeper'/1882809, l='MpServer', x=205.75, y=35.00, z=-1305.56], uz['item.item.slimeball'/2133386, l='MpServer', x=156.66, y=4.00, z=-1224.31], tt['Pig'/172, l='MpServer', x=205.47, y=71.00, z=-1311.31], uz['item.item.slimeball'/2133388, l='MpServer', x=155.66, y=4.00, z=-1223.59], tt['Pig'/173, l='MpServer', x=195.78, y=70.00, z=-1316.38], tt['Pig'/174, l='MpServer', x=194.84, y=70.00, z=-1310.88], wa['Skeleton'/1916595, l='MpServer', x=185.94, y=24.00, z=-1299.39], uz['item.item.slimeball'/2133390, l='MpServer', x=159.50, y=4.00, z=-1225.44], tt['Pig'/175, l='MpServer', x=193.66, y=70.00, z=-1309.81], tt['Pig'/176, l='MpServer', x=200.69, y=71.00, z=-1308.56], uz['item.item.slimeball'/2133392, l='MpServer', x=158.09, y=4.00, z=-1225.16], tt['Pig'/181, l='MpServer', x=222.34, y=64.00, z=-1352.84], tt['Pig'/182, l='MpServer', x=214.00, y=68.00, z=-1342.03], tt['Pig'/183, l='MpServer', x=215.91, y=70.00, z=-1334.06], tt['Pig'/184, l='MpServer', x=216.16, y=70.00, z=-1324.19], tt['Pig'/185, l='MpServer', x=216.06, y=71.00, z=-1300.09], tt['Pig'/186, l='MpServer', x=206.91, y=70.00, z=-1296.03], tu['Rabbit'/187, l='MpServer', x=214.94, y=71.00, z=-1279.72], tt['Pig'/188, l='MpServer', x=217.00, y=71.00, z=-1280.00], tt['Pig'/189, l='MpServer', x=223.16, y=72.00, z=-1264.47], tu['Rabbit'/190, l='MpServer', x=232.22, y=73.00, z=-1281.81], tt['Pig'/191, l='MpServer', x=227.91, y=73.00, z=-1287.03], we['Zombie'/2209694, l='MpServer', x=239.50, y=47.00, z=-1276.50], tu['Rabbit'/192, l='MpServer', x=231.06, y=72.00, z=-1276.78], tt['Pig'/193, l='MpServer', x=240.31, y=71.00, z=-1314.56], vn['Creeper'/2157028, l='MpServer', x=183.50, y=31.00, z=-1338.50], uz['item.item.slimeball'/2177268, l='MpServer', x=126.06, y=4.00, z=-1324.22], uz['item.item.slimeball'/2177271, l='MpServer', x=126.09, y=4.00, z=-1325.88], we['Zombie'/2135803, l='MpServer', x=187.31, y=32.00, z=-1309.06], we['Zombie'/2135804, l='MpServer', x=194.59, y=34.00, z=-1303.31], wd['Witch'/2125822, l='MpServer', x=228.50, y=22.00, z=-1326.50], wc['Spider'/2135806, l='MpServer', x=197.31, y=38.19, z=-1304.63], wa['Skeleton'/2216959, l='MpServer', x=252.50, y=12.00, z=-1278.50], vn['Creeper'/2097350, l='MpServer', x=198.50, y=36.00, z=-1307.50], vn['Creeper'/2097351, l='MpServer', x=198.50, y=36.00, z=-1306.50], vn['Creeper'/2026483, l='MpServer', x=217.78, y=59.00, z=-1274.31], uz['item.item.slimeball'/2188242, l='MpServer', x=124.78, y=4.00, z=-1316.06]]
Retry entities: 0 total; []
Server brand: vanilla
Server type: Non-integrated multiplayer server
Stacktrace:
at bdb.a(SourceFile:309)
at ave.b(SourceFile:2293)
at ave.a(SourceFile:334)
at net.minecraft.client.main.Main.main(SourceFile:124)

– System Details –
Details:
Minecraft Version: 1.8.7
Operating System: Windows 8.1 (amd64) version 6.3
CPU: 4x Intel(R) Core(TM) i5-3230M CPU @ 2.60GHz
Java Version: 1.8.0_25, Oracle Corporation
Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Oracle Corporation
Memory: 30780584 bytes (29 MB) / 1060372480 bytes (1011 MB) up to 1060372480 bytes (1011 MB)
JVM Flags: 6 total; -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump -Xmx1G -XX:+UseConcMarkSweepGC -XX:+CMSIncrementalMode -XX:-UseAdaptiveSizePolicy -Xmn128M
IntCache: cache: 0, tcache: 0, allocated: 0, tallocated: 0
Launched Version: 1.8.7
LWJGL: 2.9.4
OpenGL: Intel(R) HD Graphics 4000 GL version 4.0.0 - Build 10.18.10.3316, Intel
GL Caps: Using GL 1.3 multitexturing.
Using GL 1.3 texture combiners.
Using framebuffer objects because OpenGL 3.0 is supported and separate blending is supported.
Shaders are available because OpenGL 2.1 is supported.
VBOs are available because OpenGL 1.5 is supported.

Using VBOs: No
Is Modded: Probably not. Jar signature remains and client brand is untouched.
Type: Client (map_client.txt)
Resource Packs: [LB Photo Realism x64 10.0.0-converted-1374012776846.zip, LBPR-1.8-Pre2 x64.zip, [1.8.3]_R3D.CRAFT_SR-512x_v0.2.2.zip]
Current Language: English (US)
Profiler Position: N/A (disabled)
2:
---- Minecraft Crash Report ----
// Why is it breaking

Time: 6/5/15 5:51 PM
Description: Initializing game

bmg: Unable to fit: minecraft:blocks/hardened_clay_stained_silver - size: 512x512 - Maybe try a lowerresolution resourcepack?
at bmf.c(SourceFile:60)
at bmh.b(SourceFile:197)
at bmh.a(SourceFile:77)
at bot.j(SourceFile:553)
at bot.a(SourceFile:139)
at bou.a(SourceFile:23)
at bnn.a(SourceFile:99)
at ave.am(SourceFile:448)
at ave.a(SourceFile:310)
at net.minecraft.client.main.Main.main(SourceFile:124)

A detailed walkthrough of the error, its code path and all known details is as follows:
---------------------------------------------------------------------------------------

– Head –
Stacktrace:
at bmf.c(SourceFile:60)
at bmh.b(SourceFile:197)
at bmh.a(SourceFile:77)
at bot.j(SourceFile:553)
at bot.a(SourceFile:139)
at bou.a(SourceFile:23)
at bnn.a(SourceFile:99)
at ave.am(SourceFile:448)

– Initialization –
Details:
Stacktrace:
at ave.a(SourceFile:310)
at net.minecraft.client.main.Main.main(SourceFile:124)

– System Details –
Details:
Minecraft Version: 1.8.7
Operating System: Windows 8.1 (amd64) version 6.3
CPU: 4x Intel(R) Core(TM) i5-3230M CPU @ 2.60GHz
Java Version: 1.8.0_25, Oracle Corporation
Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Oracle Corporation
Memory: 64515960 bytes (61 MB) / 1060372480 bytes (1011 MB) up to 1060372480 bytes (1011 MB)
JVM Flags: 6 total; -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump -Xmx1G -XX:+UseConcMarkSweepGC -XX:+CMSIncrementalMode -XX:-UseAdaptiveSizePolicy -Xmn128M
IntCache: cache: 0, tcache: 0, allocated: 0, tallocated: 0
Launched Version: 1.8.7
LWJGL: 2.9.4
OpenGL: Intel(R) HD Graphics 4000 GL version 4.0.0 - Build 10.18.10.3316, Intel
GL Caps: Using GL 1.3 multitexturing.
Using GL 1.3 texture combiners.
Using framebuffer objects because OpenGL 3.0 is supported and separate blending is supported.
Shaders are available because OpenGL 2.1 is supported.
VBOs are available because OpenGL 1.5 is supported.

Using VBOs: No
Is Modded: Probably not. Jar signature remains and client brand is untouched.
Type: Client (map_client.txt)
Resource Packs: [LB Photo Realism x64 10.0.0-converted-1374012776846.zip, LBPR-1.8-Pre2 x64.zip, [1.8.3]_R3D.CRAFT_SR-512x_v0.2.2.zip]
Current Language: English (US)
Profiler Position: N/A (disabled)
If this(or at least the crashes) is a bug, can Mojang fix it?
If this isn't a bug, why is it crashing/resetting?